Physicians

Shea Aiken, M.D.

Joined AAMGi in 2011

Work Locations

• Santa Rosa Memorial Hospital
• Sutter Medical Center Santa Rosa

Medical School
University of California at San Diego

Undergraduate School
University of California at Riverside

Training
Residency at Stanford University; Fellowship in Cardiothoracic Anesthesia, Stanford; Board certified in Anesthesia.

Other Information
Dr. Aiken serves in various leadership positions at AAMGI and is a past Chief Financial Officer. He is also the current Chairman of the Department of Anesthesiology at Santa Rosa Memorial Hospital. His hobbies include photography, mountain biking and camping.

Colin Bauer, M.D.

Joined AAMGi in 2013

Work Locations

• Santa Rosa Surgery and Endoscopy Center
• Santa Rosa Memorial Hospital
• Petaluma Valley Hospital

Medical School
University of Rochester

Undergraduate School
Rice University, with a degree in Psychology

Training
Residency in Anesthesiology at UCLA; Board certified in Anesthesia.

Other Information
Dr. Bauer is the current President of AAMGI .

David Blue, M.D.

Joined AAMGi in 2018

Work Locations

• Sutter Medical Center Santa Rosa
• Queen of the Valley Medical Center
• Santa Rosa Memorial Hospital

Medical School
Loma Linda University

Undergraduate School
Pacific Union College

Training
Georgetown University Hospital Internal Medicine and Anesthesia

Darin Brandt, D.O.

Joined AAMGi in 2010

Work Locations

• Santa Rosa Memorial Hospital
• Sutter Medical Center Santa Rosa

Medical School
Kirksville College of Osteopathic Medicine

Undergraduate School
Central Washington University

Training
Internship at Osteopathic Medical Center of Texas and Residency at Oregon Health and Sciences University; Fellowship at NAPE Executive Trans Esophageal Echocardiography, University of Nebraska, and Omaha. Board Certified in Anesthesia, Board Certified in Trans Esophageal Echocardiography.

Darin Brunson, M.D.

Joined AAMGi in 1997

Work Locations

• Laservue Eye Center
• Plastic Surgery Associates
• Santa Rosa Memorial Hospital
• Santa Rosa Surgery and Endoscopy Center

Medical School
University of California at Davis

Undergraduate School
University of California, Santa Barbara

Training
Internship with Kaiser Permanente, San Francisco, CA, Residency with University of California, Davis – Chief Resident 1995-1996. Board Certified in Anesthesia.

Other Information
Dr. Brunson is a Santa Rosa, California native and has two sons and one daughter. His interests include basketball, skiing, golfing and bicycling.

Robert Bumann, M.D.

Joined AAMGi in 2017

Work Locations

• Santa Rosa Memorial Hospital

Medical School
Ludwig-Maximilian University, Munich Germany

Training
Anesthesia Residency at the University of South Florida

Other Information
Sports especially cycling, photography, traveling, and high altitude and hyperbaric medicine.

Adrian Chase, M.D.

Joined AAMGi in 2016

Work Locations

• Santa Rosa Memorial Hospital
• Petaluma Valley Hospital
• Queen of the Valley Medical Center

Medical School
University of Cincinnati School of Medicine

Undergraduate School
UC Berkeley

Training
Anesthesiology Residency at UC Davis; Board Eligible in Anesthesia

Other Information
Dr. Chase enjoys scuba diving, cycling and traveling.

Patricia L. Decker, M.D.

Joined AAMGi in 2007

Work Locations

• Queen of the Valley Medical Center
• Santa Rosa Memorial Hospital

Medical School
Residency at Stanford University and UCLA. Board certified in Anesthesia

Undergraduate School
Rhodes College, University of Tennessee

Other Information
Dr. Decker is a member of VeloMed. Her hobbies include running, cycling, skiing, traveling and cooking.

Heather Hagerman, M.D.

Joined AAMGi in 2008

Work Locations

• Queen of the Valley Medical Center

Medical School
St. Louis University School of Medicine

Undergraduate School
Drury University

Training
Internship and Residency at Vanderbilt University. Board certified in Anesthesia.

Other Information
Dr. Hagerman is the Vice Chairman of the Department of Surgery at Queen of the Valley Medical Center. She enjoys winemaking, hiking, cycling and mountain biking.

Matthew Harper, M.D.

Joined AAMGi in 2013

Work Locations

• Pediatric Dental Initiative
• Sutter Medical Center Santa Rosa

Medical School
Tulane University School of Medicine

Undergraduate School
Brigham Young University

Training
Anesthesiology Residency Johns Hopkins University; Board certified in Anesthesia.

Other Information
Dr. Harper enjoys spending time with his family

Angela Henszel, M.D.

Joined AAMGi in 2017

Work Locations

• Queen of the Valley Medical Center
• Santa Rosa Memorial Hospital
• Sutter Medical Center Santa Rosa

Medical School
University of Nevada School of Medicine, Reno, Nevada

Undergraduate School
University of Western Ontario, London, Canada

Training
Residency in Anesthesiology at University of Iowa Hospitals and Clinics; Board Certified in Anesthesia

Other Information
Dr. Henszel enjoys family fun with her husband and 2 sons (traveling, hiking, swimming, walks, painting, reading, downhill skiing). She also has passion for equestrian sport/dressage riding and gardening (flowers not veggies). The Henszels also grow their own grapes and make their own Howell Mountain wine! She also does weight training for general health.

Eric Huczko, M.D.

Joined AAMGi in 2008

Work Locations

• Queen of the Valley Medical Center
• Healdsburg District Hospital

Medical School
University of Virginia, Charlottesville VA

Undergraduate School
University of Pittsburg, Pittsburgh, PA

Training
Internship: California Pacific Medical Center, San Francisco; Residency: University of California Medical Center, San Francisco; Board Certified in Anesthesia.

James Mark Hurd, M.D.

Joined AAMGi in 1995

Work Locations

• Laservue Eye Center
• North Bay Eye Associates
• Petaluma Valley Hospital
• Santa Rosa Memorial Hospital

Medical School
Tulane University, New Orleans, Louisiana

Undergraduate School
University of San Francisco

Training
Internship at St. Mary’s Hospital and Medical Center; Residency at University of California Medical Center, Irvine. Board Certified in Anesthesia.

Other Information
An avid lover of arts, Dr. Hurd developed and produced the first Annual Medical Art Show at Tulane, presenting art of Attendees and Medical Students. He enjoys painting, running, golf, tennis, and good wine.

Jon Karch, M.D.

Joined AAMGi in 2015

Work Locations

• Santa Rosa Memorial Hospital
• Sutter Medical Center Santa Rosa

Medical School
Pennsylvania State University College of Medicine

Undergraduate School
University of California at Berkeley

Training
Residency at University of California Los Angeles; Fellowship in Critical Care Medicine at University of California Los Angeles. Board certified in Anesthesiology. Board Certified in Critical Care Medicine.

Other Information
Dr. Karch’s hobbies include cooking, mountain biking, hiking, camping, snowboarding, and yoga.

Patrick Kinane, D.O.

Joined AAMGi in 2010

Work Locations

• Petaluma Valley Hospital
• Santa Rosa Memorial Hospital
• Santa Rosa Surgery and Endoscopy Center
• Queen of the Valley Medical Center

Medical School
Touro University College of Osteopathic Medicine

Undergraduate School
University of Oregon

Training
Residency at University of Southern California. Board certified in Anesthesia.

Other Information
Dr. Kinane is the Medical Director of Anesthesia at Petaluma Valley Hospital. He is also a member of VeloMed and enjoys mountain biking, skiing and travel.

Jeffrey Kuhn, M.D.

Joined AAMGi in 1994

Work Locations

• Advanced Surgery Institute
• Laservue Eye Center
• North Bay Eye Associates
• Santa Rosa Surgery and Endoscopy Center
• Sutter Medical Center Santa Rosa

Medical School
University of Chicago Medical School

Undergraduate School
UCLA

Training
Residency in internal medicine at Stanford University; Fellowship in pulmonary and critical care medicine at UCLA and Cedars Sinai; Residency in anesthesiology at UCLA. Board certified in Anesthesia.

Other Information
Dr. Kuhn is a member of VeloMed and a regular volunteer for Operation Access. His hobbies include skiing, golfing and bike riding.

Anna V. Logvinova, M.D.

Joined AAMGi in 2009

Work Locations

• Petaluma Valley Hospital
• Queen of the Valley Medical Center
• Santa Rosa Memorial Hospital
• Santa Rosa Surgery and Endoscopy Center

Medical School
M. Sechenov Moscow Medical Academy

Training
University of Washington in Anesthesiology and Perioperative care at UCSF. Board certified in Anesthesia.

Other Information
Dr. Logvinova participates in Operation Access and volunteers as a physician for the San Francisco Boys Chorus Away Camp in Healdsburg. Her interests include classical music, travel, cooking, gardening and spending time with her children.

Steven Marlowe, M.D.

Joined AAMGi in 2007

Work Locations

• Sutter Medical Center Santa Rosa

Medical School
George Washington University

Undergraduate School
Stanford University

Training
Residency at Stanford University 1989; Internship: Santa Clara County Valley Medical Center, Santa Clara, CA; Fellowship: Virginia Mason Clinic, Pain/Regional Anesthesia; Board Certified in Anesthesia.

Daniel Masluk, M.D.

Joined AAMGi in 2007

Work Locations

• Queen of the Valley Medical Center

Medical School
Medical University of Pecs, Hungary and Tulane University School of Medicine

Undergraduate School
UCLA

Training
Residency in Anesthesiology at University of California, Irvine. Board certified in Anesthesia.

Other Information
Dr. Masluk was Chief of Medical Staff at Queen of the Valley Medical Center from 2003 to 2005. He joined AAMGI in 2007 after 18 years as a solo practitioner. His hobbies include playing the piano, bicycling, scuba diving and cooking. He reads voraciously.

Margaret McEvoy, M.D.

Joined AAMGi in 1994

Work Locations

• Santa Rosa Memorial Hospital
• Santa Rosa Surgery and Endoscopy Center

Medical School
University of California, Davis

Undergraduate School
University of California, San Francisco

Training
Internship AT Kaiser Permanente, San Francisco; Residency at University of California, Davis; Board Certified in Anesthesia.

Other Information
Dr. McEvoy is the current elect Chief of Staff of Santa Rosa Memorial Hospital and has previously served as the Medical Director of Petaluma Valley Hospital Operating Rooms, Anesthesia Section Chairman at Santa Rosa Memorial Hospital, Medical Director of Santa Rosa Memorial Operating Rooms, and Chairman of the Wellbeing Committee at Santa Rosa Memorial Hospital. She is a native of Sonoma County, growing up in Petaluma. Dr. McEvoy is an avid runner and an active aunt to her eleven nieces and nephews.

Basavaraj Nagappala, M.D.

Joined AAMGi in 2007

Work Locations

• Pediatric Dental Initiative
• Petaluma Valley Hospital
• Santa Rosa Memorial Hospital
• Santa Rosa Surgery and Endoscopy Center
• Sutter Medical Center Santa Rosa

Medical School
New York Medical College

Undergraduate School
Mysore University, India

Training
Internship at Our Lady of Mercy Medical Center, Bronx, NY and residency at Westchester Medical Center, at New York Medical College. Board Certified in Anesthesia.

Other Information
Dr. Nagappala has a special interest in regional and pediatric anesthesia.

Roberto A. Neisa, M.D.

Joined AAMGi in 2018

Work Locations

• Santa Rosa Memorial Hospital
• Queen of the Valley Medical Center
• Healdsburg District Hospital
• Sutter Medical Center Santa Rosa

Medical School
Stanford University School of Medicine

Undergraduate School
Brown University,

Training
PhD, Columbia University Residency , University of Rochester, New York Board Certified in Anesthesiology B.S.in Biology, Brown University

Other Information
Dr. Neisa's hobbies include, Running, Hiking, and Snowboarding.

John W. Nimtz, M.D.

Joined AAMGi in 1991

Work Locations

• Santa Rosa Memorial Hospital
• Santa Rosa Surgery and Endoscopy Center

Medical School
University of Michigan

Undergraduate School
University of Michigan

Training
Community Hospital of Sonoma County Family Practice 1979-1982. University of California, San Francisco; Associate Clinical Professor of UCSF in 1986. Board certified in Anesthesia as well as Family Medicine.

Other Information
Dr. Nimtz is a past President and Chief Medical Officer of AAMGI. He is also a member of VeloMed and volunteers at the Redwood Empire Food Bank. His hobbies include running, hiking, bicycling, backpacking, gardening and canning.

Adeyemi Ogunkoya, M.D.

Joined AAMGi in 2018

Work Locations

• Santa Rosa Memorial Hospital
• Petaluma Valley Hospital
• Santa Rosa Surgery and Endoscopy Center

Medical School
Columbia College of Physicians and Surgeons, New York

Undergraduate School
John Hopkins University

Training
SUNY Downstate in Brooklyn, New York; Board certified in Anesthesia.

Other Information
Professional Wrestling, Mixed Martial Arts, Wine Tasting, MCU Movies

Richard Pollock, M.D.

Joined AAMGi in 2017

Work Locations

• Sutter Medical Center Santa Rosa
• Petaluma Valley Hospital
• Santa Rosa Memorial Hospital

Medical School
Johns Hopkins University

Undergraduate School
Michigan State University

Training
Johns Hopkins Hospital Anesthesiology Residency, Board Certified Anesthesia

Robert M. Pousman, D.O.

Joined AAMGi in 2013

Work Locations

• Healdsburg District Hospital
• Santa Rosa Surgery and Endoscopy Center
• Sutter Medical Center Santa Rosa

Medical School
Temple University/UMDNJ-SOM

Undergraduate School
Temple University/UMDNJ-SOM

Training
Residency in Anesthesiology and Fellowship in Critical Care Medicine at University of Texas and Houston/Hermann Hospital; Board certified in Anesthesia, as well as critical care medicine.

Other Information
Dr. Pousman’s hobbies include mountain biking, snowboarding, surfing and trail running.

Christopher Press, M.D.

Joined AAMGi in 2016

Work Locations

• Santa Rosa Memorial Hospital
• Sutter Medical Center Santa Rosa

Medical School
Tulane University

Undergraduate School
Emory University

Training
Residency at Stanford University; Fellowship in Cardiovascular and Thoracic Anesthesia at Stanford University; Board certified in Anesthesia.

Other Information
Dr. Press enjoys swimming, biking, and scuba diving.

Donald Reeves, M.D.

Joined AAMGi in 1995

Work Locations

• Petaluma Valley Hospital
• Santa Rosa Surgery and Endoscopy Center
• North Bay Eye Associates

Medical School
University of California, Davis

Undergraduate School
University of California, Los Angeles

Training
Internship and Residency at University of California, Davis Medical Center; Board

Other Information
Dr. Reeves enjoys spending time off work with his wife and two sons at their Petaluma home.

Catherine M. Roby, D.O.

Joined AAMGi in 2016

Work Locations

• Santa Rosa Memorial Hospital
• Petaluma Valley Hospital
• Sutter Medical Center Santa Rosa
• Santa Rosa Surgery and Endoscopy Center

Medical School
Midwestern University - Arizona College of Osteopathic Medicine

Undergraduate School
University of California, Davis

Training
Residency in Anesthesiology at University of Texas Southwestern in Dallas, TX; Board certified in Anesthesia.

Other Information
Hobbies and interests include wine, traveling, musical theater, piano, tennis, and the San Francisco Giants.

Jerrad Roby, D.O.

Joined AAMGi in 2017

Work Locations

• Sutter Medical Center Santa Rosa
• Santa Rosa Memorial Hospital
• Queen of the Valley Medical Center

Medical School
Midwestern University – Arizona College of Osteopathic Medicine, Glendale

Undergraduate School
Northern Arizona University, Flagstaff

Training
Fellowship in Cardiothoracic Anesthesiology at UT Southwestern Medical Center , Dallas TX. Residency in Anesthesia at UT Southwestern Medical Center, Dallas; Board Certified in Anesthesia

Frederick Romberg, M.D.

Joined AAMGi in 2018

Work Locations

• Sutter Medical Center Santa Rosa
• Santa Rosa Memorial Hospital
• Healdsburg District Hospital
• Santa Rosa Surgery and Endoscopy Center

Medical School
Yale Medical School

Undergraduate School
Virginia Tech

Training
Clinical Fellow at Cambridge Health Alliance at Harvard. Anesthesia Resident at the University of Utah; Board certified in Anesthesia.

Dirk Schermer, M.D.

Work Locations

• Laservue Eye Center
• North Bay Eye Associates
• Plastic Surgery Associates
• Santa Rosa Memorial Hospital
• Santa Rosa Surgery and Endoscopy Center
• Sutter Medical Center Santa Rosa

Medical School
University of California, San Francisco

Undergraduate School
University of California, Davis

Training
Internship at Kaiser Permanente, San Francisco; Residency and Fellowship at University of California, San Francisco; Board Certified in Anesthesia

Other Information
Dr. Schermer has been active in leadership and is a past President of AAMGI.

Karen M. Schmidt, D.O.

Joined AAMGi in 1991

Work Locations

• Santa Rosa Memorial Hospital

Medical School
Kansas City University of Medicine and Biosciences

Undergraduate School
UCLA

Training
Internship, Bay City, MI; Anesthesiology Residency at University of Michigan, Ann Arbor. Board certified in Anesthesia, as well as Osteopathic Medicine.

Other Information
Dr. Schmidt is a member of Bethlehem Lutheran Church’s Health Ministry Committee, Caring Connection Committee and Baptismal Cradle Roll. She is also a member of VeloMed and plays racquetball. She is the winner of 2014 National Singles Women’s 55+ A level and third in Women’s all age A’s, 2014 Sonoma County Senior Games Women’s second place.

Kseniya Shvachko, M.D.

Joined AAMGi in 2015

Work Locations

• Santa Rosa Memorial Hospital
• Sutter Medical Center Santa Rosa
• 4th Street Laser & Surgery Center
• North Bay Eye Associates
• Santa Rosa Surgery and Endoscopy Center

Medical School
Ural State Medical Academy

Training
Internal Medicine residency at Saint Mary's Medical Center, San Francisco 2009-2012, Board Certified in Internal Medicine; Anesthesiology and Pain Medicine residency at UC Davis Medical Center 2012-2015, Board Certified in Anesthesiology and Pain Medicine

Other Information
Dr. Shvachko enjoys beautiful weather and nature of Northern California, hiking, gardening, traveling, wine tasting, exploring new places and classical music.

Robert C. Singler, M.D.

Joined AAMGi in 2007

Work Locations

• Queen of the Valley Medical Center

Medical School
Duke University

Undergraduate School
Oberlin College

Training
Internship (Surgery) and Residency at University of California, San Francisco; Fellowship at Virginia Mason Clinic, Seattle, WA; Board Certified in Anesthesia. Dr. Singler has previously served as an Assistant Clinical Professor, UC San Francisco. Board Certified in Anesthesia.

Other Information
Dr. Singler has previously served as the Medical Director of the Queen of the Valley Outpatient Surgery & Procedure Center as well as the Chief of Anesthesia Department at Queen of the Valley Medical Center. He has also served as a member of the board of directors of the California Society of Anesthesiologists as well as in numerous other professional leadership roles. Dr. Singler is a Colonel in the Air Force Reserve, and has served as an anesthesiologist and flight surgeon for many years. More recently, he was the commander of a field hospital in Iraq during the conflict in 2003. Col. Singler currently serves as a Reservist attached for advisory duty at the Pentagon, Washington, DC.

Stephen P. Ternlund, M.D.

Joined AAMGi in 2021

Work Locations

• Petaluma Valley Hospital
• Santa Rosa Surgery and Endoscopy Center

Medical School
University of Colorado Health Sciences Center. Denver, Colorado

Undergraduate School
University of Colorado, Boulder Colorado.

Training
Anesthesiology Residency at Stanford University Medical Center. ABA Board Certification 2006

Other Information
Dr. Ternlund enjoys spending time outdoors with wife and two children, sports, fly fishing, snowboarding, mountain biking, hiking, cooking music .

Peter B. Thornhill, M.D.

Joined AAMGi in 2017

Work Locations

• Santa Rosa Memorial Hospital
• Sutter Medical Center Santa Rosa
• Healdsburg District Hospital

Medical School
McGill Univeristy

Undergraduate School
McGill University

Training
Residency in Anesthesiology, SUNY Downstate Medical Center

Scott Tweten, M.D.

Joined AAMGi in 2007

Work Locations

• North Bay Eye Associates
• Petaluma Valley Hospital
• Santa Rosa Surgery and Endoscopy Center

Medical School
Tulane University School of Medicine

Undergraduate School
Northwestern University

Training
Internship at University of Minnesota; Residency at Stanford University

Other Information
Dr. Tweten is actively involved in leadership activities in AAMGI. He worked in Marin County for a decade before joining AAMGI. He resides in rural Sonoma County with his family.

Maulin U. Vora, M.D.

Joined AAMGi in 2020

Work Locations

• Santa Rosa Memorial Hospital
• Sutter Medical Center Santa Rosa

Medical School
Smt. N.H.L. Municipal Medical College, Ahmedabad, India

Undergraduate School
University of Nebraska Medical Center ( UNMC ) Omaha, Nebraska

Training
Dr. Vora completed his Anesthesiology Residency at University of Nebraska ,and Fellowship in Critical Care Medicine at Stanford University Medical Center. Board certified in Anesthesia.

Dean Walker, M.D.

Joined AAMGi in 2019

Work Locations

• Queen of the Valley Medical Center
• Santa Rosa Memorial Hospital

Medical School
University of California San Diego, School of Medicine , La Jolla California

Undergraduate School
Stanford University , Palo Alto , California

Training
Residency in Anesthesiology at Stanford University Medical Center , Palo Alto, California ;Board certified in Anesthesia.

Morgan A. Welch, D.O.

Joined AAMGi in 2022

Work Locations

• Sutter Medical Center Santa Rosa
• Santa Rosa Memorial Hospital
• Santa Rosa Surgery and Endoscopy Center

Medical School
Midwestern University , Arizona College of Medicine

Undergraduate School
University of Kansas

Training
Anesthesiology Residency at University of Illinois in Chicago ABA Board Eligible, Pain Management at Summit Pain Alliance

Other Information
Dr Welch enjoys traveling , backpacking, Scuba, Racquetball, cooking.

Antonio Wong, M.D.

Joined AAMGi in 2016

Work Locations

• Sutter Medical Center Santa Rosa
• Santa Rosa Memorial Hospital

Medical School
University of California San Francisco

Undergraduate School
University of California Berkeley, University of California Davis

Training
Internship Internal Medicine, Highland Hospital, Oakland, California; Residency Anesthesia, Stanford University Hospital; Board Certified Anesthesia

Other Information
Dr. Wong enjoys whitewater rafting, photography, skiing, sailing, and biking.

Robert J. Wood, M.D.

Joined AAMGi in 1999

Work Locations

• Healdsburg District Hospital
• Laservue Eye Center
• Santa Rosa Memorial Hospital
• Santa Rosa Surgery and Endoscopy Center

Medical School
Cornell University Medical College

Undergraduate School
University of California, Berkeley

Training
Internship and Residency at University of California, Davis; Board Certified in Anesthesia.