Our COEM Team: Allan Lieberman, MD, FAAEM William Weirs, MD, FAAEM Bettina Herbert, MD, FAAPMR, IFMCP The Center for Occupational & Environmental Medicine specializes in preventative and personalized health care with more than 75 years of combined medical practice. Board-Certified Environmental, Functional and Integrative Medicine. We get to the root cause of your illness. Allergy Testing. Autoimmune Diseases. Womens Health.