Hollynn P. Knight, DO: Internal Medicine Looking for a new doctor? AHN Our new internal medicine physician is ready to focus on you. 412-466-5502| doctors.AHN.org/Hollynn-P-Knight Hollynn P. Knight, DO: Internal Medicine Looking for a new doctor? AHN Our new internal medicine physician is ready to focus on you. 412-466-5502| doctors.AHN.org/Hollynn-P-Knight