Dr. Rajnik attended King’s College (PA) graduating with a B.S. in Chemistry.  He received a USAF Health Professions Scholarship and attended the University of Virginia School of Medicine.  He trained in Pediatrics at the San Antonio Uniformed Services Health Education Consortium residency program and Pediatric Infectious Diseases (PEDSID) at the Uniformed Services University of the Health Sciences (USUHS) program, graduating in 2001.  Next, he was the Chief of Pediatric Infectious Disease in San Antonio.  He returned to USUHS and served as the Program Director for the PEDSID Fellowship Program for ten years.  Additionally, he served as the Consultant to the USAF Surgeon General for PEDSID, the President of the Armed Forces Infectious Diseases Society, and chaired the American Academy of Pediatrics Section on Uniformed Services.  In 2016, he retired from Active Duty staying at USUHS as the Director of the Division of Pediatric Infectious Diseases.