Meet our Residents

AM Year 2

A professional headshot of Samuel Stephenson
Samuel Stephenson, MD, MS

PGY-4
Internal Medicine/Aerospace Medicine
A professional headshot of Daniel Cox
Daniel Cox, MD, MS

PGY-5
Prior Training: Emergency Medicine

AM Year 1

Clare McNerlin, MD

PGY-3
Emergency Medicine/Aerospace Medicine
Daniel Kaganov, MD

PGY-3
Emergency Medicine/Aerospace Medicine
A professional headshot of Dr. Byun-Andersen.
Marshall Byun-Andersen, MD

PGY-4
Prior Training: Emergency Medicine/Family Medicine
A professional headshot of Dr. Fleischer.
Jennifer Fleischer, MD

PGY-4
Prior Training: Emergency Medicine

A professional headshot of Dr. Roche.
Dwyer Roche, DO

PGY-4
Prior Training: Emergency Medicine

Combined Residents

A professional headshot of Wendy Collins
Wendy Collins, MD

PGY-2
Emergency Medicine/Aerospace Medicine
A professional headshot of Joshua Nowitz
Joshua Nowitz, MD

PGY-2
Emergency Medicine/Aerospace Medicine
A professional headshot of Dr. Murugesan.
Abhijay Murugesan, MD

PGY-1
Emergency Medicine/Aerospace Medicine

Recent Graduates

2026

Andrew Lam, MD, MS: Aerospace Medicine; Family Medicine

Vasilis Mavratsas, MD, MS: Aerospace Medicine; Internal Medicine

Brian Rodriguez, MD, MS: Aerospace Medicine; Internal Medicine

Christine Schwartz, MD, MS: Aerospace Medicine; Internal Medicine; Wilderness Medicine

Ethan Stephens, DO, MS: Aerospace Medicine; Family Medicine

2025

Matthew Makowski, MD, PhD, MS: Aerospace Medicine; Internal Medicine; Pulmonary Diseases & Critical Care Medicine; Undersea and Hyperbaric Medicine
Placement: UTMB/KBR/NASA Johnson Space Center

Jeffrey McBride, MD, MS: Aerospace Medicine; Psychiatry
Placement: Houston Psychiatry

Samantha King, MD, MS: Aerospace Medicine; Emergency Medicine/Ultrasound
Placement: Federal Aviation Administration Headquarters

2024

Rebecca Mendelsohn, MD, MPH: Aerospace Medicine; Emergency Medicine
Placement: UTMB/KBR/NASA Johnson Space Center

Craig Kutz, MD, PhD, MPH: Aerospace Medicine; Emergency Medicine
Placement: UTMB/KBR/NASA Johnson Space Center

Isaiah Reeves, MD, MPH: Aerospace Medicine; Internal Medicine
Placement: Axiom Space, Inc.

Michael LaBarbera, MD, PhD, MPH: Aerospace Medicine; Internal Medicine
Placement: Aerospace Medicine Consultant; Internal Medicine

2023

Kristi Ray, DO, MPH: Aerospace Medicine; Family Medicine; Undersea and Hyperbaric Medicine  
Placement: UTMB/KBR/NASA Johnson Space Center

Karen Ong, MD, PhD, MPH: Aerospace Medicine; Internal Medicine
Placement: Virgin Galactic

Lt Col Bashir El-Khoury, MD, MPH: Aerospace Medicine; Internal Medicine; Nephrology
Placement: US Air Force

Lt Col Brian Hanshaw, DO, MPH: Aerospace Medicine; Family Medicine
Placement: US Air Force, MacDill AFB

2022

William Fernandez, MD, MPH: Aerospace Medicine; Emergency Medicine
Placement: UTMB/KBR/NASA Johnson Space Center

Quinn Dufurrena, MD, MPH: Aerospace Medicine; Internal Medicine
Placement: UTMB/KBR/NASA Johnson Space Center

John Marshall, MD, MPH: Aerospace Medicine; Internal Medicine
Placement: Axiom Space, Inc.

Michael Rhode, MD, MBA, MPH: Aerospace Medicine; Internal Medicine/Clinical Pathology
Placement: US Air Force

2021

Michelle Hong Chan, MD, PharmD, MPH: Preventive Medicine- Aerospace; Emergency Medicine
Placement: Axiom Space, Inc.

William Valencia, MD, MPH: Preventive Medicine- Aerospace; Family Medicine
Placement: UTMB/KBR/NASA Johnson Space Center

Contacts

Aerospace Medicine Residency 
University of Texas Medical Branch
301 University Boulevard
Galveston, Texas 77555-1150

Phone: (409) 747-6131
Email: AerospaceMed@utmb.edu

Professional photo of Amy Kreykes, MD, MPH
Amy Kreykes, MD, MPH
Program Director
Aerospace Medicine
ajkreyke@utmb.edu

Professional photo of Estella Carrasco
Estella Carrasco
Residency Coordinator
Aerospace Medicine
escarras@utmb.edu