UNITED STATES DISTRICT COURT MIDDLE DISTRICT OF FLORIDA TAMPA DIVISION CARIBBEAN HYPERBARIC MEDICINE, LLC, and TYLER D. SEXTON, Plaintiffs, v. Case No. 8:24-cv-684-KKM-AAS BARRY MICHAEL MEUSE, and CRYSTAL CREEK HEALTHCARE CAPITAL LLC, Defendants. ___________________________________ ORDER Caribbean Hyperbaric Medicine, LLC, and Dr. Tyler Sexton sue Barry Meuse and his company, Crystal Creek Healthcare Capital LLC, in connection with an agreement

between the parties to start a medical business. Compl. (Doc. 2). Because the plaintiffs fail to establish subject-matter jurisdiction, this action is dismissed. Dr. Sexton and Caribbean sue Meuse and Crystal Creek for breach of contract,

unjust enrichment, and fraudulent inducement in connection with an effort to open a hyperbaric medicine1 business. Compl. ¶¶ 36–59. e defendants failed to appear after

1 “Hyperbaric [o]xygen [t]herapy . . . involves the inhalation of 100 [percent] oxygen at increased atmospheric pressures.” , No. 614CV283ORL31KRS,

, at *2 (M.D. Fla. May 11, 2016). It can be used to treat a variety of conditions. ; , CLEVELAND CLINIC (last visited Mar. 24, 2025), https://perma.cc/68KZ-WYVF. being properly served, (Docs. 7, 11), and the clerk entered a default against them, (Doc.

17). Dr. Sexton and Caribbean then moved for the entry of default judgment. (Doc. 23). e Magistrate Judge returned a Report and Recommendation recommending entry of judgment in favor of the plaintiffs in the amount of $1,844, 641.60 plus interest, as well as

attorney’s fees. R&R (Doc. 31). After reviewing the record, I ordered the plaintiffs to show cause why the case should not be dismissed for lack of subject-matter jurisdiction. (Doc. 32). Particularly, I ordered

the plaintiffs to explain why the complaint adequately alleged the parties’ citizenship, and I permitted them to “submit . . . affidavits or other evidence showing diverse citizenship.” Dr. Sexton and Caribbean have availed themselves of the opportunity, but their evidence

does not establish diversity jurisdiction. A “court must ensure that it has jurisdiction over the parties” before it enters default judgment. , No. 8:23-CV-1420-TGW,

, at *3 (M.D.

Fla. Mar. 27, 2024). Jurisdiction based on diversity of citizenship requires complete diversity between the parties—no defendant may be a citizen of the same state as any plaintiff, and vice versa. ,

, 267–68 (1806) (Marshall,

C.J.);

(a). A natural person is a citizen of the place they are domiciled (that is, the last place where they were present and intended to remain indefinitely). ,

, 1257–58 (11th Cir. 2002) (per

2 curiam). Mere residence is insufficient to establish citizenship. ,

(11th Cir. 2013). An unincorporated entity like an LLC is a citizen of all the states of which its members are citizens. ,

(11th Cir. 2004) (per curiam). Any deficiency

in the pleading of diversity jurisdiction may be disregarded if the plaintiff submits evidence that shows that Article III jurisdiction exists. ,

. To start, Dr. Sexton and Caribbean’s complaint fails to allege diversity jurisdiction.

It fails entirely to allege Dr. Sexton’s citizenship, and as it alleges that he is Caribbean’s sole member, Compl. ¶ 1, it fails to allege Caribbean’s citizenship as well. As for the defendants, the complaint alleges only Meuse’s residence. ¶ 2. And even if it alleged

Meuse’s citizenship, it does not allege that he is Crystal Creek’s sole member. ¶¶ 2–3. It is thus impossible to tell from the complaint whether diversity jurisdiction exists. e plaintiffs’ supplemental evidence establishes more, but still not enough. e

recent filing establishes the plaintiffs’ citizenship. Dr. Sexton’s affidavit explains that by July 2023 he was present in Florida and intended to remain there indefinitely. Sexton Aff. (Doc. 35-1) at 2. Combined with his allegation that he is Caribbean’s sole member, that makes

both Dr. Sexton and Caribbean Florida citizens. ,

; , 293 F.3d at 1257–58. But that is as far as the new evidence goes. While a screenshot of Crystal Creek’s website tends to show that Meuse and Sally Engel

3 are its members, (Doc. 35-2) at 9, the evidence does not establish the citizenship of either.

A process server’s affidavit tends to show that Engel resided in Evanston, Illinois as of March 19, 2024. (Doc. 35-3) at 1 (“Direct neighbor confirms Sally Engel to currently reside at location.”). But residence is insufficient to establish citizenship. ,

. And even if the evidence were sufficient as to Engel, Dr. Sexton and Caribbean offer no evidence of Meuse’s citizenship. While their brief claims that “Meuse was a citizen of Virginia at the time of filing,” (Doc. 35) at 6, “a sentence in an unsworn brief is not

evidence,” ,

. e plaintiffs therefore fail to show the defendants’ citizenship. e plaintiffs thus fail to establish subject-matter jurisdiction. Accordingly, the

following is ORDERED: 1. is action is DISMISSED WITHOUT PREJUDICE for lack of subject- matter jurisdiction. 2. e Report and Recommendation (Doc. 31) is REJECTED AS MOOT.

3. e Motion for Final Default Judgment (Doc. 23) is DENIED AS MOOT. 4. e clerk is directed to TERMINATE any pending deadlines and to CLOSE

this case.

4 ORDERED in Tampa, Florida, on March 25, 2025.

pate 4 Mizelle United States District Judge