Kirby joined Black Hills Orthopedic and Spine Center in 2006. He earned his Nursing degree from South Dakota State University before completing his Medical Studies degree from Midwestern University in Illinois. Kirby is certified through the National Commission on Certification of Physician Assistants with professional memberships in the American Academy of Physician Assistants, South Dakota Academy of Physician Assistants and Physician Assistants in Orthopaedic Surgery.