Dr. Lieberman joined PRA Health Sciences as a Medical Director in 2017 after 4 years as a Regional Medical Director for Merck Vaccines. Before joining Merck, he was Medical Director of Infectious Diseases at Quest Diagnostics and Laboratory Director for Focus Diagnostics, an infectious diseases reference laboratory owned by Quest.
Before joining Quest in 2007, Dr. Lieberman was professor of clinical pediatrics at the University of California, Irvine (UCI) and chief of infectious diseases at Miller Children's Hospital in Long Beach. While there, he was the recipient of the Golden Apple Teaching Award from the UCI School of Medicine seven times and the Faculty Teaching Award from Miller Children's Hospital four times.
His clinical research activities included the evaluation of vaccines, other biologics, and antimicrobials in children. He has published articles on a wide variety of infectious disease topics and was frequently an invited lecturer at national and international meetings.