Dr. Kern is the Chief of Urologic Oncology in the Murtha Cancer Center at the Uniformed Services University and Walter Reed National Military Medical Center. He is the founding Director of the Testicular cancer Enterprise for Survivorship, Treatment, and Investigational Sciences “TESTIS” Program at the Murtha Cancer Center, USU. He is also the Program Director of the National Capital Consortium Walter Reed Urology Residency. Prior to completing an advanced fellowship in Urologic Oncology at Indiana University, Dr. Kern was a staff urologist , Urology Service Chief, and Director of Surgical Quality at Fort Belvoir Community Hospital (renamed Alexander T. Augusta Military Medical Center) Fort Belvoir, VA, for four years. Dr. Kern's research interests are focused on the genetics of germ cell testicular cancer, surgical treatment and management of chemotherapy-resistant testicular cancer, and survivorship. He is also interested in the surgical treatment and quality of life aspects of bladder and prostate cancer. He is board certified by the American Board of Urology and a member of the Society of Urologic Oncology, American Urological Association, and Society of Government Service Urologists. Dr Kern is a member of the Board of Directors for the Testicular Cancer Awareness Foundation.

He was named the 2025 Young Urologist of the Year by the American Urological Associate in the United States. 

He was also recognized by the US Army Surgeon General for clinical expertise with the "9A" designation.