Board of Directors

Aubrey Maze, MD -- Chairman of the Board

Dr. Maze has been a Director of PPM since 1988 and Chair since 2001. Dr. Maze is a founding member and the Chief Executive Officer of Valley Anesthesiology & Pain Consultants, Ltd. and Senior Vice President of Anesthesia Clinical Services at Sheridan Healthcare. Dr. Maze serves as the Executive Chair and Professor of the Department of Anesthesiology at The University of Arizona College of Medicine-Phoenix, and Academic Division Chief of Pediatric Anesthesiology Department of Child Health at The University of Arizona College of Medicine-Phoenix. Dr. Maze is a practicing board-certified anesthesiologist and pediatrician.

Sandra L. Beretta, MD

Dr. Beretta has been a Director of PPM since 2017. She has been a Director of NORCAL Mutual Insurance Company since 2011 and currently serves at its Chair. Dr. Beretta has also served as a member of its Claims Advisory Committee since 2003. Dr. Beretta is a managing partner of a private practice partnership in San Mateo, CA and has been a practicing OB/GYN for nearly 25 years.

Fabiola Cobarrubias, MD, MBA

Dr. Cobarrubias has been a Director of PPM since 2017. She has been a Director of NORCAL Mutual Insurance Company since 2012, and served as a hospitalist consultant to NORCAL’s Claims Advisory Committee since 2008. She is a hospitalist at California Pacific Medical Center, where she held the position of Medical Director - Hospitalist Service from 2004 to 2011. She is also a founder, past president and current board member of Pacific Inpatient Medical Group.

Patricia A. Dailey, MD

Dr. Dailey has been a Director of PPM since 2017. Dr. Dailey has been a Director of NORCAL Mutual Insurance Company since 2004. Dr. Dailey has served as President of the California Society of Anesthesiologists, and has practiced as an anesthesiologist in San Mateo County for more than 28 years. She currently is a Director of Mills-Peninsula Medical Group.

Scott Diener, MSIM, CPCU, ARe

Mr. Diener has been a Director of PPM since 2017. He has been a Director of NORCAL Mutual Insurance Company since 2015. Mr. Diener has served as President and Chief Executive Officer for the NORCAL Group of companies since 2011. He is a 37-year veteran of the insurance industry, specializing in medical professional liability. His work has spanned several areas of the industry including claims, risk management and business development.

Robert P. Edwards, MD

Dr. Edwards has been a Director of PPM since 2011. Dr. Edwards is a board-certified anesthesiologist practicing in the Salt Lake City, UT area. He has served as an Executive Board member and Treasurer of the Utah Society of Anesthesiologists and as Assistant Professor of Anesthesiology at The University of California at San Francisco.

Steven J. Hattamer, MD

Dr. Hattamer has been a Director of PPM since 2012. Dr. Hattamer is a board-certified anesthesiologist practicing in Nashua, NH. He is President and Chairman of Nashua Anesthesia Partners. He serves on the Board of the American Society of Anesthesiologists (ASA) and is the New Hampshire Director. He is past President of the New Hampshire State Society of Anesthesiologists and currently serves as ASA Delegate to the New Hampshire Medical Society.

Harry B. Richardson, Jr. MD

Dr. Richardson has been a Director of PPM since 2017. Dr. Richardson has previously served on the Board of NORCAL Mutual Insurance Company from 1995 to 2012. He retired from the practice of Hematology/Medical Oncology in Sonoma County in 2003 after 29 years. He served as the Medical Director of the Blood Bank of the Redwoods. He was chief of the medical staff and on the Board of Trustees of Santa Rosa Memorial Hospital and was the founding Medical Director of Home Hospice of Sonoma County.

William R. Vetter, MD

Dr. Vetter has been a Director of PPM since 2017. Dr. Vetter previously served on the Board of Directors of NORCAL Mutual Insurance Company from 1996 to 2010. While on the NORCAL Board, he served as chair of the Governance and Underwriting Committees. Dr. Vetter practices with Sutter Medical Group as an Invasive Cardiologist and served as President of the Sacramento Sierra Valley Medical Society in 1995.