Petitioners, Ham Marine Inc. (Ham) and its Longshore & Harbor Workers Compensation Act (LHWCA) insurance carrier, Eagle Pacific Insurance Company (Eagle), appeal the decision of the Benefits Review Board (BRB) affirming the decision of the Administrative Law Judge (ALJ) holding Robert Keyes, Jr. (Keyes) entitled to LHWCA compensation benefits from Ham on account of injury sustained by Keyes May 5, 1999, in the course of his employment with Ham. Keyes was subsequently employed by P & T Insulation Company Inc. (P & T) from August 1999 until March 3, 2000. 1

The sole contentions of petitioners Ham and Eagle before this court are:

First, that the ALJ and the BRB “erred in finding that ... [Keyes’s] work at P & T did not aggravate, accelerate or combine with the initial [May 5, 1999] injury [while employed at Ham] so as to terminate the liability of Ham Marine with regard to ... [the May 5,1999] injury;” and

Second (and last), that the BRB erred in affirming the ALJ’s decision because the ALJ erroneously discounted evidence of two doctors and a therapist who treated Keyes and credited the evidence of Dr. Bazzone.

*302 We reject these contentions and affirm the BRB.

We may not reweigh the evidence or substitute our own view of the facts for those of the ALJ, but must instead affirm the ALJ’s findings if they are supported by substantial evidence. Director, OWCP v. Ingalls Shipbuilding, Inc., 125 F.3d 303, 305 (5th Cir. 1997). In this context, findings by the trier of fact may be affirmed even though we deem them to be contrary to the weight of the medical testimony. See, e.g., Todd Shipyards Corp. v. Donovan, 300 F.2d 741, 742 (5th Cir. 1962). “Credibility determinations and the resolution of conflicting evidence are the prerogative of the fact finder, here the ALJ” and “he is entitled to weigh the medical evidence — including the relative credibility of the competing experts ... ”. Atlantic Marine, Inc. v. Bruce, 661 F.2d 898, 900 (5th Cir. 1981) (internal quotation marks and citations omitted). The ALJ found that Keyes’s condition was “the natural result” of the May 5, 1999 injury he sustained while in the course of his employment by Ham and was not in fact “aggravated, exacerbated or worsened by working with P & T.” Considering the record as a whole, this finding is supported by substantial evidence, including, but by no means limited to, the testimony of Dr. Bazzone. This finding by the ALJ, and our determination that it is supported by substantial evidence on the record as a whole, is, under a view of the law most favorable to Ham, fatal to its contention that the effects on Keyes’s condition of his work with P & T terminated the liability of Ham (and Ham does not contend otherwise).

We further conclude that the ALJ adequately explained, and showed good cause, why in the challenged respects he gave greater weight to the testimony of Dr. Bazzone than to that of Drs. McCluskey and Fineburg and the physical therapist. See Scott v. Heckler, 770 F.2d 482, 485 (5th Cir. 1985).

Accordingly, the decision of the BRB is AFFIRMED.