REAC/TS welcomes new team members: John Crapo, Josh Hayes and David Quillin New employees bring extensive military and radiation experience, medical expertise and law enforcement backgrounds

April 26, 2022

OAK RIDGE, Tenn.—The Radiation Emergency Assistance Center/Training Site (REAC/TS) in Oak Ridge, Tenn., welcomes three new team members: John Crapo, Josh Hayes and David Quillin.

John Crapo, health physicist, Radiation Emergency Assistance Center/Training Site (REAC/TS)

John Crapo

John Crapo joins the team as a part-time health physicist after retiring from the National Nuclear Security Administration, where he served as a program manager in the Office of Nuclear Incident Response. Prior to that, Crapo spent nine years with Oak Ridge Associated Universities (ORAU) working on its flagship contract, the Oak Ridge Institute for Science and Education, serving as associate director for its national security programs. His experience also includes 26 years of active duty in the U.S. Navy, serving as a nuclear engineering technician and radiation specialist, retiring at the rank of lieutenant commander.

Crapo earned his bachelor’s degree in radiological health physics at the University of Massachusetts, Lowell; his master’s degree in health physics at Georgetown University; and a master’s degree in environmental health from the School of Public Health, Harvard University. Crapo is certified in the Comprehensive Practice of Health Physics by the American Board of Health Physics, serves as the president of Clarksburg Community Assistance Network and is the executive administrator at Cedarbrook Community Church, Clarksburg, Md.

Josh Hayes, Ph.D., health physicist, Radiation Emergency Assistance Center/Training Site (REAC/TS)

Josh Hayes, Ph.D

Josh Hayes, Ph.D, joins the team as a health physicist. He served in the U.S. Marine Corps as a defense specialist and spent most of his enlistment stationed in Okinawa, Japan, where he was able to respond to the Fukushima nuclear disaster in 2011. That experience led Josh to pursue goals in studying radiological sciences. 

Hayes holds a bachelor’s degree in biomedical sciences, a master’s degree in health physics and a doctorate degree in radiological health from Colorado State University (CSU). While working at CSU, he had the opportunity to travel several times for extended stays to Fukushima, Japan, to work with wildlife biologists and veterinarians, studying the impacts the environmentally dispersed radiation from the Fukushima nuclear disaster was having on wildlife. Specifically, he studied the hematological system of wild boar and field mice, which lead him to ORAU in 2018 for a summer internship. 

Following completion of his doctorate degree in 2020, Hayes moved to Vienna, Austria, to work for the International Atomic Energy Agency as a radiobiologist and biodosimetrist. In his spare time, he enjoys running the trails at Frozen Head State Park.

David Quillin, nurse, Radiation Emergency Assistance Center/Training Site (REAC/TS)

David Quillin

David Quillin comes to REAC/TS as a nurse. Most recently Quillin worked as an occupational health nurse at Oak Ridge National Laboratory. Prior to that, he worked as a critical care nurse at Fort Sanders Regional Medical Center while also working with the Knox County Sheriff’s Office as a reserve patrol officer. In addition to nursing, Quillin brings with him many years of law enforcement experience. He holds a bachelor’s degree in nursing from the University of Tennessee, Knoxville, and a master’s degree in business administration from the University of Kentucky.



REAC/TS is an Oak Ridge Institute for Science and Education facility managed by ORAU for the U.S. Department of Energy with the mission to strengthen the medical response to radiological and nuclear incidents. REAC/TS provides 24/7 medical support and deployment to provide emergency medical consultation for incidents involving radioactive materials and ionizing radiation worldwide. REAC/TS also conducts ongoing research into the biological effects of radiation and provides continuing medical education for healthcare providers, other professionals and students. For more information, visit

Media Contacts

Pam Bonee
Director, Communications
Phone: 865.603.5142

Wendy West
Manager, Communications
Phone: 865.207.7953

The Oak Ridge Institute for Science and Education (ORISE) is a U.S. Department of Energy (DOE) asset that is dedicated to enabling critical scientific, research, and health initiatives of the department and its laboratory system by providing world class expertise in STEM workforce development, scientific and technical reviews, and the evaluation of radiation exposure and environmental contamination.

ORISE is managed by ORAU, a 501(c)(3) nonprofit corporation and federal contractor, for DOE’s Office of Science. The single largest supporter of basic research in the physical sciences in the United States, the Office of Science is working to address some of the most pressing challenges of our time. For more information, please visit