CPWR – The Center for Construction Research and Training (www.cpwr.com) is seeking a new Principal Investigator (PI) 1 for The Building Trades National Medical Screening Program – BTMed (www.btmed.org). BTMed provides free medical screening services to construction workers formerly employed at Department of Energy (DOE) nuclear weapons sites, who may be at risk for occupational illnesses. BTMed is national in scope with a coordinating staff of 40 and 225 medical providers under contract. The program serves a dynamic cohort of 30,000 older construction workers, the largest of its kind in the world. The PI is responsible for assuring that the program is ethically and technically sound and that its data are used to understand the adverse health out