Brentwood-headquartered American Addiction Centers (AAC), a national provider of inpatient and outpatient substance abuse treatment services, recently announced the appointed of Lawrence M. Weinstein, MD, ABHM, as its new chief medical officer.

Weinstein began his new role in mid-August overseeing medical operations and supervising medical staff for all AAC facilities. He brings more than 20 years' experience in psychiatry, addiction and managed care to his new role. Weinstein most recently served as CMO at Humana Behavioral Health, a position he held since 2011. Prior to that, he served as senior vice president of medical affairs for Catasys, Inc. in California,

The announcement of Weinstein's new role coincided with the news that AAC's previous national medical director, Mark Calarco, DO, had been promoted to national medical director for clinical diagnostics. In this role, Calarco will work closely with Addiction Labs to conduct medical and laboratory research, as well as develop innovative products and services that will improve patient outcomes.