Dr. Gerald Mastaw is an anesthesiologist practicing in Ann Arbor, MI. Dr. Mastaw ensures the safety of patients who are about to undergo surgery. Anestesiologists specialize in general anesthesia, which will (put the patient to sleep), sedation, which will calm the patient or make him or her unaware of the situation, and regional anesthesia, which just numbs a specific part of the body. As an anesthesiologist, Dr. Mastaw also might help manage pain after an operation.