Meet Our Team
Dr. Gerhart Flacke, M.D.
Dr. Flacke has been working as an anesthesiologist in Tucson since 2006 and did subspeciality care in cardiac and obstetric anesthesia. He is a former Chief of Cardiac Anesthesia at Tucson Medical Center.
Dr. Flacke is thrilled to work in an ambulatory setting, which allows him to maximize the time he has with his beloved family. Prior to starting his medical career, Gary was a professional triathlete for ten years and competed at the worldwide level.
Medical School: Creighton University School of Medicine
Residency: University of Arizona
Board Certifications: American Board of Anesthesiologists
Memberships: American Society of Anesthesiologists, Society of Cardiovascular Anesthesiologists (2008 – 2018)
Dr. Monica Guzman, M.D.
Dr Guzman is from Puerto Rico "La Isla del Encanto.” She finished residency in 2016 and immediately started working at Tucson’s busiest hospital, Tucson Medical Center. While at TMC, she honed her skills to become a very well-rounded anesthesiologist.
She loves Tucson. She has embraced the perks of living in such a beautiful state and loves hiking, biking, and camping trips with her family. She channels her love of nature and faith in God and is known for encasing those around her with peace and serenity.
Medical School: Ponce School of Medicine & Health Sciences
Residency: University of Arizona
Board Certification: American Board of Anesthesiology
Memberships: American Society of Anesthesiologists
Dr. Neesann Marietta, M.D.
Dr. Marietta is the founder of Desert Sunrise Anesthesia. She is a Harvard-trained anesthesiologist and been providing anesthesia care in Tucson since 2013.
She realized that control over her schedule was something she needed as her family grew and the pandemic gave her time to ponder about what was most important in her life. Facing so many unknowns gave her the bravery to take a leap of faith in her professional career and start her own solo practice, which has evolved to a platform that attracts anesthesiologists aligned with similar core values.
Medical School: University of Missouri-Columbia
Residency: Beth Israel Deaconess Medical Center
Board Certification: American Board of Anesthesiology
Memberships: American Society of Anesthesiologists
Dr. Philip Isaac, M.D., M.B.B.S
Dr. Philip Isaac is from Wales, but has dual citizenship and has lived and practiced in the U.S.A. for 30 years. He has extensive experience in academic medicine and private practice, and completed fellowships in research and cardiac anesthesia. He was medical director of a renowned sports medicine surgery center in Oklahoma, and was an attending anesthesiologist at the VA Medical Center here in Tucson. In his spare time he loves to be outdoors, hiking and biking, playing tennis and pickleball, and flying a small airplane.
Medical School: London University
Residency: St. Mary’s Hospital, London U.K.
Advanced Specialist Training: University of Wales College of Medicine
Fellowship Training: National Heart Hospital, London U.K.
Board Certification: American Board of Anesthesiologists, Fellow of the Royal College of Anaesthetists, London U.K.