President Obama’s pick to become the next U.S. Surgeon General might have to explain his credentials a bit. Half of the doctors who work in his specialty at his own hospital finished residency before him.

Dr. Vivek Murthy, 36, was nominated by President Obama for the Surgeon General post last November, but Democrats are backing off from his nomination reportedly due to his well-documented anti-gun advocacy. But his relative lack of medical experience might also come up in a confirmation hearing.

Murthy is listed as a Hospitalist and Hospitalist Service specialist at Brigham and Women’s Hospital in Boston, having completed his residency in internal medicine there in 2006. Of the 42 listed Hospitalist Service specialists at Brigham and Women’s, 21 doctors finished residency before Murthy.

Three fellow specialists finished residency at Brigham and Women’s the same year as Murthy and two of them are also Harvard Medical School instructors like Murthy. Additionally, eleven doctors in the specialty, formed at the hospital in 1998, have completed fellowships, which Murthy has not. The most experienced Hospitalist Service specialist at the hospital finished his residency in 1975, before Murthy was born.