Medical Anesthesia Consultants Medical Group, Inc. (MAC) provides anesthesiology and pain management services and also provides anesthesia group management consulting. It serves hospitals, medical centers, surgery centers, and physicians’ offices in California. The company was founded in 1985 and is based in Walnut Creek, California. As of November 14, 2013, Medical Anesthesia Consultants Medical Group, Inc. operates as a subsidiary of Sheridan Healthcare, Inc.