MEMORANDUM OPINION

Plaintiff, a federal annuitant, claims that individuals at the Transportation Security Administration (“TSA”) violated the Age Discrimination in Employment Act of 1967 (“ADEA”), 29 U.S.C. § 621 et. seq., when they refused to extend a salary offset waiver which had allowed plaintiff to collect his full salary without any offset for the amount of his annuity. Plaintiff, who was 58 years old at the time, further claims that he was retaliated against for contacting the EEO office with respect to the alleged discrimination. Defendant filed a motion to dismiss or for summary judgment. Because matters outside the pleadings are considered, defendant’s motion is treated as a motion for summary judgment. See Rule 12(d), Fed.R.Civ.P.; Rule 56, Fed.R.CivJP.

I.1

Typically, if an annuitant is rehired by the federal government after retirement, the annuitant’s salary is reduced by the amount of their annuity. The U.S. Office of Personnel Management (“OPM”) is permitted, however, to delegate to an agency the authority to waive such salary offsets “on a case-by-case basis, for an employee serving on a temporary basis, but only if, and for so long as, the authority is necessary due to an emergency involving a direct threat to life or property or other unusual circumstances.” 5 U.S.C. § 8344(f). TSA, which was established in November 2001, was granted such authority on February 27, 2002 based on its urgent need to hire experienced professionals and lack of other staffing options, the enormity of the Aviation and Transportation Security Act mandates, and the direct threat to life and property demonstrated by the September 11th attacks. Specifically, TSA was granted the authority to provide such waivers for periods of up to five years, but importantly, waivers could *544only be granted where there were no other reasonable staffing options, and the waivers had to be terminated when the conditions that made them necessary changed. See Def. Ex. 18-1.

On August 27, 2004, plaintiff, then still employed by the Bureau of Alcohol, Tobacco and Firearms (“ATF”), was offered the position of Assistant Federal Security Director for Law Enforcement (“AFSDLE”) at Baltimore/Washington Thurgood Marshall Airport (“BWI”). The offer noted that, as required by law, plaintiffs salary would be reduced by the amount of any annuity. On August 30, 2004, plaintiff declined the offer noting that while he was a current federal employee, he was requesting a five-year salary offset waiver so that he could retire and be rehired by TSA and receive both a full salary and annuity. Plaintiffs request for a waiver was granted based on findings (i) that plaintiff would refuse employment without it, and (ii) that there was no other reasonable staffing options. But plaintiffs waiver was only approved for a period of three years because there was no supporting rationale for a five-year waiver and no plan to identify a pool of candidates who had the potential to be a permanent successor. Subsequently, plaintiff retired from ATF, effective November 12, 2004, and was appointed as the AFSD-LE at BWI for a period not to exceed three years, effective November 14, 2004. During his tenure with TSA, plaintiff also served in his personal capacity as president of the Federal Law Enforcement Officers Association (FLEOA), a volunteer, nonpartisan professional association for federal law enforcement officers that provides them with legal assistance and representation and also lobbies for the passage of legislation beneficial to them.

On June 12, 2006, in response to a request to extend TSA’s waiver authority, the OPM delegated new salary offset waiver authority to the Department of Homeland Security (“DHS”), which subsequently re-delegated that authority to TSA.2 Specifically, the OPM delegated the authority to extend current waivers from five to seven years, but noted that any request to extend a current waiver must demonstrate that conditions justifying the initial waiver still existed. See Def. Ex. 18-7, Def. Ex. 18-8. In a letter dated November 14, 2006, plaintiff was advised that TSA’s Executive Resource Council (“ERC”) reviewed the new grant of authority, considered the long term interests of the agency, and recommended that most incumbents not receive a waiver extension, and that the Assistant Secretary for TSA concurred with this recommendation. As a result, the letter stated that very few waivers would be extended, and that plaintiff would be notified approximately six months prior to the expiration of his waiver regarding the specific decision in his case. The letter reiterated that waivers would be extended only where no other reasonable staffing options existed.

Plaintiff alleges that two senior TSA employees who participated in ERC meetings, namely Gale Rossides, who was 53 in 2008, and Michael Restovich, who was 60 in 2008, made statements that demonstrated discriminatory animus based on age, specifically:

• On October 18, 2005, Rossides told plaintiff that she was not in favor of renewing the waivers because it would block the career paths of younger employees and that the rehired annuitants “would have to step aside so the younger people could move up.”

• On September 19 or 20, 2006, at the TSA Federal Security Director Conference in St. Louis, Restovich, referring to rehired annuitants, stated “I *545see you as old, white and pathetic and it is time to rid ourselves of this type of leadership.”

• On September 26 or 27, 2006, at the TSA Northeast Area Federal Security Director Conference in New York, Restovieh stated that the rehired annuitants “would have to step aside so TSA could hire more minorities,” and, “[l]ook around, you’re all old, white and gray haired.”

• In September 2006, at the TSA West Coast Federal Security Director Conference, Restovieh made statements similar to those made in New York and St. Louis.

• In September 2006, at the TSA Western States Conference for Model Workplace Coordinators, Restovieh stated that, “TSA is too white and too gray and changes are needed to reflect the diverse society in which we live.”

On January 11, 2007, plaintiff contacted the EEO office by telephone to file an informal age discrimination complaint. Plaintiff filed a formal complaint in April 2007.3 Plaintiff alleges that on January 18, 2007, TSA Counsel Ron Kilroy advised him that TSA had some ethical concerns regarding his service as FLEOA president. On February 5, 2007, Elizabeth Buchanan, TSA’s Deputy Chief Counsel, sent a memorandum to plaintiff outlining the ethics rules governing his activities as president of FLEOA in light of his status as a TSA employee. On February 16, 2007, FLEOA’s general counsel — also counsel for plaintiff in this matter — responded to Buchanan suggesting her descriptions of potential conflicts of interest were overly broad and requesting clariflcation. On February 20, 2007, plaintiffs attorney wrote a second letter to Buchanan, suggesting that Buchanan’s initial letter was an act of retaliation in response to plaintiffs contact with the EEO office. On March 28, 2007, Buchanan sent plaintiff a revised memorandum, modifying portions of the original memorandum in response to the points made by plaintiffs counsel. Buchanan also responded to plaintiffs counsel that neither she nor any other TSA headquarters ethics official knew of plaintiffs contact with the EEO office prior to receiving the letter from plaintiffs counsel on February 20, 2007 and that the initial memorandum was sent because ethics officials learned of plaintiffs service as president of FLEOA and determined that he had not received advice regarding applicable ethical rules.

On May 7, 2007, TSA’s Assistant Administrator for Human Capital informed plaintiff that his waiver would not be extended beyond the termination of his original three-year appointment. Plaintiff was advised that if he wished to be considered for continued employment without a waiver, he should notify his manager within ten days. On June 8, 2007, a TSA field operations official contacted plaintiff, noting that plaintiff had not specified whether he wished to be considered for continued employment without a waiver. Plaintiff responded that his decision to remain with TSA, with or without a waiver, would be decided by the EEOC or federal court based on his discrimination complaint. Plaintiff alleges that previously, on February 2, 2005, Dan Sullivan, the TSA Assistant Director for Law Enforcement, told plaintiff that plaintiff would receive a two-year extension on his waiver.

*546TSA subsequently announced it was seeking applicants for six AFSD-LE positions, including plaintiffs position at BWI, and sought applications by October 5, 2007. The announcement resulted in twenty applicants deemed qualified as competitive candidates, as well as applications from four persons who could be reassigned to the position non-competitively. Plaintiff did not apply. Ultimately, TSA selected a retired Secret Service agent in his fifties with similar federal law enforcement experience to plaintiff, who would serve without a waiver. Plaintiffs appointment expired on November 13, 2007, and he separated from TSA.

II.

Summary judgment is appropriate where, on the basis of undisputed material facts, the moving party is entitled to judgment as a matter of law. Rule 56(a), Fed.R.Civ.P. See Celotex Corp. v. Catrett, 477 U.S. 317, 322, 106 S.Ct. 2548, 91 L.Ed.2d 265 (1986). The question on summary judgment is “whether a reasonable jury could find in favor of the non-moving party, taking all inferences to be drawn from the underlying facts in the light most favorable to the non-movant[.]” In re Apex Express, 190 F.3d 624, 633 (4th Cir. 1999). Rule 56 mandates summary judgment if the nonmoving party, after a reasonable time for discovery, “fails to make a showing sufficient to establish the existence of an element essential to that party’s case, and on which that party will bear the burden of proof at trial.” Celotex, 477 U.S. at 322, 106 S.Ct. 2548. To defeat summary judgment, the non-moving party may not rest upon a mere “scintilla” of evidence, but must set forth specific facts showing a genuine issue for trial. Anderson v. Liberty Lobby, Inc., 477 U.S. 242, 252, 106 S.Ct. 2505, 91 L.Ed.2d 202 (1986).

III.

Plaintiffs first claim is that the ERC impermissibly considered age in the decision not to extend his waiver.4 The Fourth Circuit has outlined “two avenues of proof’ through which “a plaintiff may avert summary judgment and establish a claim for intentional ... age discrimination.” Hill v. Lockheed Martin Logistics Mgmt., 354 F.3d 277, 284 (4th Cir. 2004). Specifically, a plaintiff may establish such a claim either (i) by “demonstrating through direct or circumstantial evidence that ... age discrimination motivated the employer’s adverse employment decision,” or (ii) by way of the McDonnell Douglas framework “under which the employee, after establishing a prima facie case of discrimination, demonstrates that the employer’s proffered permissible reason for taking an adverse employment action is actually a pretext for discrimination.” Id. at 284-285. Plaintiff asserts the McDonnell Douglas framework does not apply because there is direct evidence of discrimination. See TWA, Inc. v. Thurston, 469 U.S. 111, 121, 105 S.Ct. 613, 83 L.Ed.2d 523 (1985). As a result, the analysis proceeds by way of the first avenue.5

*547A.

An unlawful decision may involve both permissible and discriminatory factors. See Hill, 354 F.3d at 284. The parties dispute whether the ADEA is violated only if plaintiffs age was the “but for” cause of the decision not to extend the waiver or whether there is an ADEA violation if plaintiffs age was considered at all, even if not a determining factor. A brief review of the relevant Supreme Court and circuit authority aids in resolving this dispute.

In Price Waterhouse, a Title VII case held applicable to ADEA actions,6 the Supreme Court held that when a plaintiff demonstrates an impermissible consideration was a factor in a decision, the burden then shifts to the defendant “who could escape liability by proving that it would have made the same decision in the absence of the discriminatory motivation.” Hill, 354 F.3d at 284 (citing Price Waterhouse v. Hopkins, 490 U.S. 228, 276, 109 S.Ct. 1775, 104 L.Ed.2d 268 (1989)). In response to Price Waterhouse, Congress amended Title VII in 1991, eliminating “the employer’s ability to escape liability in Title VII mixed-motive cases by proving that it would have made the same decision in the absence of the discriminatory motivation,” and instead, allowing an employer only to use such proof to limit the available remedies. Hill, 354 F.3d at 284. Of course, this Congressional intervention only pertained to Title VII, not ADEA, and in ADEA actions, the Fourth Circuit continued to apply the Price Waterhouse burden-shifting framework. See EEOC v. Warfield-Rohr Casket Co., 364 F.3d 160, 164 n. 2 (4th Cir. 2004). As a result, employers in this circuit could continue to escape liability in ADEA actions by demonstrating the same personnel decision would have been made in the absence of any discriminatory animus. Id. at 164.

Recently, the Supreme Court held that the Price Waterhouse burden-shifting framework cannot apply to ADEA claims because ADEA’s statutory language requires “the plaintiff retain[ ] the burden of persuasion to establish that age was the ‘but-for’ cause of the employer’s adverse action.” Gross v. FBL Financial Services, Inc., 557 U.S. 167, 177, 129 S.Ct. 2343, 174 L.Ed.2d 119 (2009). In Gross, however, the Supreme Court reached its conclusion based on a close reading of the ADEA provision that creates a cause of action against private employers, 29 U.S.C. § 623(a). Yet, at issue here is not § 623(a), but rather § 633a, which creates a cause of action for federal employees. And importantly, the language of § 633a differs from § 623(a). Specifically, § 623(a) prohibits personnel decisions made “because of’ a person’s age, while § 633a provides that personnel actions “shall be made free from any discrimination based on age.” Based on this difference, the Court of Appeals for the D.C. Circuit recently held that Gross did not apply to claims brought pursuant to § 633a. See Ford v. Mabus, 629 F.3d 198, 205-206 (D.C.Cir. 2010). According to the D.C. Circuit, a plaintiff may- prevail on an age discrimination claim against a federal employer by demonstrating that age was a factor in the employer’s decision, even if it was not the “but for” cause. Id.

The D.C. Circuit’s analysis has substantial force, but Fourth Circuit precedent precludes its application here. Prior to *548Gross, the Fourth Circuit applied the Price Waterhouse framework to ADEA claims brought under § 633a against federal employers, stating that the same standard applied to the federal employers as private employers. See Baqir v. Principi, 434 F.3d 733, 744 (4th Cir. 2006). Thus prior to Gross, albeit within the context of the Price Waterhouse burden-shifting framework, the Fourth Circuit permitted a federal employer to avoid liability where age was a factor so long as the same decision would have been reached without considering age. Id. at 745. In other words, a claim against a federal employer would not survive if the defendant could demonstrate that age was not the “but for” cause of the decision at issue. As a result, the conclusion of D.C. Circuit, which allows a plaintiff to prevail against a federal employer where age is merely a factor, cannot be applied in this circuit, and plaintiff may only prevail if his age was the “but for” cause of the decision not to extend his waiver. See Doe v. Charleston Area Medical Center, Inc., 529 F.2d 638, 642 (4th Cir. 1975) (Fourth Circuit precedent must be followed by district court).7

B.

Plaintiff alleges that the ERC recommendation not to extend most waivers and subsequent decision not to extend his waiver were improperly based on age. It is true that TSA had the authority to extend waivers in some circumstances, but it is also clear from the record that this authority could only be exercised in extremely narrow circumstances, namely where no other reasonable staffing option existed. Moreover, the undisputed facts demonstrate that these circumstances did not exist with respect to plaintiffs position where an announcement for his and five similar positions resulted in twenty-four qualified applicants. Nonetheless, plaintiff alleges that the statements by Rossides and Restovich are direct evidence that the decision not to extend plaintiffs waiver was based on his age.8 Even accepting these statements as true, summary judgment must be granted for defendant be*549cause the undisputed evidence shows that age was not the “but for” cause of the decision not to extend plaintiffs waiver; rather, plaintiffs waiver could not be extended because the position could be filled by someone without a waiver. See Baqir v. Principi 434 F.3d 733, 744-745 (4th Cir. 2006) (even if comments attributable to decision-maker were reflective of age-based animus, summary judgment appropriate where there was undisputed evidence that plaintiff would have been terminated anyway). See also Lindsey v. Walgreen Co., 615 F.3d 873, 876 (7th Cir. 2010) (same).

It is also important to recall that there is no ADEA violation where an employer acts on the basis of a factor that correlates with age. See Hazen Paper Co. v. Biggins, 507 U.S. 604, 611, 113 S.Ct. 1701, 123 L.Ed.2d 338 (1993) (ADEA does not prohibit decisions based on pension status, even though pension status correlates with age). As a result, actions taken against rehired annuitants, such as failing to extend salary offset waivers, cannot be considered discrimination based on age simply because most rehired annuitants are older. And importantly, the contested decision did not involve terminating or refusing to re-appoint plaintiff, but simply phasing out his waiver, as required by law. This is evident from the fact that plaintiff was given the opportunity to seek re-appointment and the fact that plaintiffs replacement was in his fifties.9 In sum, on this record, whether the burden rests with the plaintiff or defendant, no reasonable fact-finder could conclude that plaintiffs age was the “but for” cause of his waiver not being extended. Rather, because plaintiffs position could be filled using normal recruitment methods, TSA lacked the authority to extend the waiver.10

Moreover, even if the standard set forth by the D.C. Circuit in Ford v. Mabus were adopted here, plaintiffs claim would still fail. Because plaintiffs position could be filled without a waiver, TSA had no authority to extend the waiver, and the relevant decision-makers did exactly what they were required to do in the circumstances. No other factors, such as plaintiffs age, could have been considered because the alleged “decision” was not a discretionary determination but rather the implementation of a mandated result. To hold otherwise would be to give plaintiff a remedy against defendant where defendant’s action was compelled by law.

IV.

Plaintiff also claims that the communications regarding conflict-of-interest *550statutes were in retaliation for his contact with the EEO office. In order to establish a prima facie case of retaliation, plaintiff must show that “(1) he engaged in protected activity; (2) an adverse employment action was taken against him; and (3) there was a causal link between the protected activity and the adverse action.” Laber v. Harvey, 438 F.3d 404, 432 (4th Cir. 2006). Defendant argues that the undisputed facts make clear that there was neither an adverse action nor any causal link between the protected activity and the putative adverse action.

A.

To prove a causal link, plaintiff must be able to demonstrate that the author of the alleged adverse action — here the letter from Buchanan — knew that plaintiff had engaged in a protected activity. See Holland v. Washington Homes, Inc., 487 F.3d 208, 218 (4th Cir. 2007). Defendant argues that there is no evidence that Buchanan, who sent the allegedly retaliatory memorandum, knew that defendant had contacted the EEO office. In this respect, defendant provides (i) the letter written by Buchanan to plaintiffs counsel stating she had no knowledge of plaintiffs contact with the EEO office, but this letter was not signed under oath, and (ii) a declaration in which Buchanan states she was not aware of plaintiffs “prior EEO activity,” but the declaration is ambiguous with respect to whether or not plaintiffs January 2007 contact with the EEO office is considered “prior EEO activity.”11

Nonetheless, because plaintiff bears the burden of proving his prima facie case, defendant need not produce affidavits or other evidence, but need only show that plaintiff has failed to create a genuine issue of material fact with respect to the causation element. See Carr v. Deeds, 453 F.3d 593, 608 (4th Cir. 2006) (quoting Celotex, 477 U.S. at 325, 106 S.Ct. 2548). Plaintiff has introduced no evidence that Buchanan — or Kilroy for that matter— knew of plaintiffs contact with the EEO office. Rather, plaintiff argues that such knowledge can be inferred by the close temporal proximity between his protected activity and the allegedly adverse action. Plaintiff argues this inference is supported by the fact that TSA management knew of plaintiffs position at the FLEOA since at least October 2005, but never previously raised potential conflicts of interest.

The Fourth Circuit has repeatedly held that summary judgment is appropriate where a plaintiff provides no evidence that a decision-maker knew of plaintiffs protected activity. See Baqir v. Principi, 434 F.3d 733, 748 (4th Cir. 2006).12 On the other hand, an inference of causation for purposes of establishing a prima facie case can be supported by “little or no direct evidence,” and some authority suggests that simply the fact that plaintiff engaged in a protected activity and then an employ*551er took an adverse action is sufficient for such an inference. Karpel v. Inova Health Sys. Servs., 134 F.3d 1222, 1229 (4th Cir. 1998).13 As a result, for purposes of this decision, it will be assumed that a reasonable jury may infer that the causation element of plaintiffs prima facie case is met. For the reasons set forth below, however, plaintiff cannot establish a prima facie case because there was no adverse action taken against him.

B.

Causation does not end the analysis, for in order to demonstrate an adverse action, “a plaintiff must show that a reasonable employee would have found the challenged action materially adverse, which in this context means it well might have dissuaded a reasonable worker from making or supporting a charge of discrimination.” Burlington Northern & Santa Fe Ry. Co. v. White, 548 U.S. 53, 68, 126 S.Ct. 2405, 165 L.Ed.2d 345 (2006) (internal quotations and citations omitted).14 Plaintiff argues that the Burlington Northern standard is met because the initial memorandum included what his counsel calls “absurd” assertions that plaintiffs activities on behalf of FLEOA could implicate him under criminal conflict-of-interest statutes. A review of the memorandum and other communications, however, reveals that no jury could find that a reasonable employee would be dissuaded from making or supporting a charge of discrimination as a result of these communications.

First, the initial memorandum contained no suggestion that plaintiff was in violation of any statute. Rather, it described the relevant statutes and their application, and advised plaintiff to contact Buchanan if he had any questions about the guidance provided. Nor does Kilroy’s statement that TSA had some ethical concerns suggest either that TSA believed plaintiff had violated the law or that any legal or disciplinary action was to follow. Notifying plaintiff about potential conflicts-of-interest, as was done in this instance, cannot be considered an adverse action. Plaintiff is not immunized from conflict-of-interest statutes because he filed a discrimination claim, and simply being told that one must abide by the law is not an “adverse action” but merely a fact. Cf. Wells v. Gates, 336 Fed.Appx. 378, 385 (4th Cir. 2009) (“An employer may enforce generally applicable employment policies against its employees without creating a cause of action for retaliation.”). To conclude otherwise would, in effect, preclude an agency from advising its employees on applicable law; something it must be able to do whether or not an employee has filed a discrimination claim.

Plaintiff argues, however, that because the original memorandum was inaccurately broad, it is elevated to the level of an adverse action. While unfounded threats of legal action may constitute an adverse action in certain circumstances, there were no threats here. Even though it did construe the statutes too broadly, the memo*552randum contained no allegation that plaintiff was in violation of those statutes. And importantly, when plaintiffs counsel notified Buchanan that the memorandum construed the applicable statutes too broadly, she issued a revised memorandum that addressed those concerns. Cf. Tepperwien v. Entergy Nuclear Operations, Inc., 663 F.3d 556, 570 (2d Cir. 2011) (letter that was later rescinded was not material adverse action); Nagle v. Village of Calumet Park, 554 F.3d 1106, 1120-1121 (7th Cir. 2009) (no adverse action where a suspension is threatened but ultimately not applied); Baloch v. Kempthorne, 550 F.3d 1191, 1199 (D.C.Cir. 2008) (same). Finally, there is no claim that the revised memorandum is overly broad, no allegation that any legal or disciplinary action was initiated against plaintiff, no evidence that the initial memorandum was intentionally overly broad, and no evidence that plaintiff was harmed or discouraged in any way. See Wells, 336 Fed.Appx. at 384-385 (quoting Somoza v. Univ. of Denver, 513 F.3d 1206, 1214 (10th Cir. 2008)) (although standard is ultimately objective, fact that employee continues undeterred “may shed light as to whether the actions are sufficiently material and adverse to be actionable”). As a result, because plaintiff alleged no action that a reasonable jury could find materially adverse, plaintiff has failed to make his prima facie case.

Furthermore, it is worth noting that even if the memorandum may be considered a materially adverse action, the undisputed record reflects a clear, non-retaliatory reason for its issuance that is not pretextual. Buchanan issued the memorandum to advise plaintiff about potential eonfliets-of-interest. In the circumstances, it was and is entirely appropriate for Buchanan — or Kilroy for that matter — to inform a TSA employee about potentially applicable federal laws, and to be available for questions if the employee subsequently believes that advice is overly broad. See Wells, 336 Fed.Appx. at 385 (application of generally applicable rules does not create cause of action for retaliation). As a result, even if plaintiff had made a prima facie case of retaliation, his claim still fails. See Baqir, 434 F.3d at 747 (plaintiff must show employer’s proffered non-retaliatory reason for action is pretextual).

V.

Accordingly, for the foregoing reasons, summary judgment must be granted for defendant. An appropriate Order will issue.