Study Leadership


Principal Investigator

Kathleen Carlson, PhD, MS is a Core Investigator in the Portland VA Health Services Research & Development Center of Innovation and the NCRAR. She is an environmental epidemiologist with a research focus on measuring outcomes such as TBI and PTSD, and their exposures, in Veterans.

Co-Principal Investigator

Kelly Reavis, PhD, MS, MPH is an epidemiologist and licensed audiologist who has been doing research with the NCRAR for more than 15 years. Her research focus is on the distribution and risk factors of auditory injuries in both Service members and Veterans.



Sarah Theodoroff, PhD is a Research Investigator/Audiologist at the NCRAR and an Associate Professor with the OHSU Department of Otolaryngology/Head and Neck Surgery. She has been with the NOISE study since it began.

M. Samantha Lewis, PhD is the Academic Lead and a Professor in the School of Audiology at Pacific University at Pacific University in Hillsboro, Oregon. She is an affiliate of the NCRAR and OHSU and has been on the NOISE study since it began.


HCE Site Investigator

Carlos Esquivel, MD is the Chief Medical Officer for the Hearing Center of Excellence (HCE) in the 59th Medical Wing of Joint Base San Antonio. He has been practicing medicine for over 15 years and served in the military for over 20 years.

Southern California Site Investigator

LCDR Charlotte Hughes, MD, MPH is the Department Head of Otolaryngology Head and Neck Surgery and Audiology at the Naval Hospital Camp Pendleton and Assistant Professor, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD.