Leadership

Andrew A. Zimmerman, M.D.
President, Anesthesia Service Medical Group, Inc. (“ASMG”) Board of Directors
CEO, Anesthesia Management Professionals, Inc. (“AMP”)

Dr. Zimmerman joined ASMG in 1999, following four years in the U.S. Navy where he achieved the rank of Lieutenant Commander, and four years in academics at Washington University and the University of Washington. Dr. Zimmerman is a board-certified pediatric cardiac anesthesiologist practicing at Rady Children’s Hospital of San Diego, where he served as Department Chair from 2012 to 2013 and as Chief of Staff from 2015 to 2017. He also served as Chair of ASMG’s Insurance Committee from 2003 to 2017 and joined the ASMG Board in 2010, assuming the role of President in 2018. Dr. Zimmerman is also the CEO of ASMG’s wholly-owned practice management company, Anesthesia Management Professionals (“AMP”), and is Vice Chair of the AMP Board.

David W. Dockweiler, M.D.
Vice President, ASMG Board of Directors

Dr. Dockweiler joined ASMG in 1988, and is board certified in anesthesia, pulmonary disease, and critical care medicine. Dr. Dockweiler practices at Scripps Memorial Hospital La Jolla, where he also served as the Anesthesia Department Chair from 2003 to 2004, and as the Medical Director from 2005 to 2021. He has been a member of the ASMG Board since 2017.

James L. Johnson, M.D.
Secretary, ASMG Board of Directors

Dr. Johnson joined ASMG in 2000, and practices at Tri-City Medical Center where he served as Department Chair from 2009 to 2011 and Medical Director of Quality Assurance from 2012 to 2021, before becoming Chief of Staff in 2021.  He has been a member of the ASMG Board since 2016.

Gus W. Kefalopoulos, M.D.
Treasurer, ASMG Board of Directors

Dr. Kefalopoulos joined ASMG in 2008, beginning his practice at Scripps Green Hospital before moving to the Sharp Mary Birch Hospital for Women & Newborns in 2018.  He has been a member of the ASMG Board since 2016.

Kent Diveley, M.D.
Member, ASMG Board of Directors

Dr. Diveley joined ASMG in 1992, following four years as a Flight Surgeon in the U.S. Navy. He began practicing at Alvarado Hospital before moving to Scripps Mercy Hospital in 1998, where he served as Anesthesia Section Chair from 2001 to 2004, Chief of Surgery from 2006 to 2008, and Chief of Staff from 2011 to 2013.  He is currently the Medical Director of the Scripps Mercy Surgery Pavilion, and has been a member of the ASMG Board since 2018.

Sepehr S. Tabibzadeh, M.D.
Member, ASMG Board of Directors

Dr. Tabibzadeh joined ASMG in 2005, practicing at Sharp Memorial Hospital where he served as Subgroup Chief from 2014 to 2016.  He has been a member of the ASMG Board since 2017.

Theo B.M. van den Helder, M.D.
Member, ASMG Board of Directors

Dr. van den Helder joined ASMG in 1999, beginning his practice at Alvarado Hospital where he served as Department Chair from 2004 to 2005, before moving to Sharp Chula Vista Medical Center in 2011 where he served as Department Chair and Medical Director, and then to Scripps Green Hospital in 2015.  He has been a member of the ASMG Board since 2020.

Peter O. Raudaskoski, M.D., Pharm. D.
Chief Medical Officer, ASMG

Dr. Raudaskoski joined ASMG in 1990, beginning his practice at Alvarado Hospital before moving to Scripps Memorial Hospital La Jolla in 1998. He chaired ASMG’s Physician Resources & Scheduling Committee from 1998 to 2004 before joining the ASMG Board in 2004, where he served as President from 2006 to 2012. Dr. Raudaskoski has continued to serve ASMG as its Chief Medical Officer since 2017, and he also sits on the AMP Board of Directors.

Mark S. Ransom, M.D.
Chair, Anesthesia Management Professionals (“AMP”) Board of Directors

Dr. Ransom joined ASMG in 1997 while practicing at Tri-City Medical Center, before moving his practice to Carlsbad Surgery Center in 2008 where he became Medical Director. Dr. Ransom also chaired ASMG’s Contracting & Compliance Committee before joining the ASMG Board in 2008, and served as ASMG’s President from 2012 to 2018.  He has served as Board Chair of AMP, ASMG’s wholly-owned practice management company, since 2018.

Michael C. Martin, M.D.
Member, AMP Board of Directors

Dr. Martin joined ASMG in 1988, and practices at Scripps Memorial Hospital La Jolla where he served as Department Chair from 2013 to 2017. He served on the ASMG Board of Directors from 1993 to 2004, during which time he was President from 1994 to 1998, and he currently serves on the AMP Board.

Glenn E. Buberl, Esq.
General Counsel, AMP

Mr. Buberl joined ASMG’s practice management staff in 1999 and became General Counsel of AMP in 2006, overseeing ASMG’s self-insured malpractice trust, compliance program, and all other legal matters.  Mr. Buberl also serves on the AMP Board of Directors.

Jeremy W. Dendle, J.D.
Chief Operating Officer, AMP

Mr. Dendle joined ASMG’s practice management staff in 1997, received his law degree in 2002, and became Chief Operating Officer of AMP in 2006, overseeing contracts, outside billing vendors, and general group operations.  Mr. Dendle also serves on the AMP Board of Directors.

Glen T. Lewandowski, C.P.A.
Chief Financial Officer, AMP

Mr. Lewandowski joined ASMG’s practice management staff in 1999 and became Chief Financial Officer of AMP in 2006, overseeing accounting, payroll, investments, and all other financial matters.  Mr. Lewandowski also serves on the AMP Board of Directors.