Meet The Physicians
Physicians associated with North Vista Hospital include:
Bernie Hanna, M.D., FACS
Dr. Hanna is a board-certified general surgeon who has performed bariatric
surgery procedures in Southern Nevada for more than 10 years.
He completed his undergraduate work at Barry University in Miami and graduated
from Howard University Medical School and its general surgery residency program.
In addition to his extensive experience performing weight loss surgeries,
Dr. Hanna has served as a trauma surgeon, an assistant clinical professor
and is a published medical researcher.
Dr. Hanna is a diplomate of the American Board of Surgeons, a member of
The American Society for Metabolic and Bariatric Surgeons, the American
College of Surgeons, the American Medical Association, the National Medical
Association, the Nevada State Medical Association, Clark County Medical
Society, the Association for the Advancement of Wound Care and the Society
of Laparoendoscopic Surgeons.
Thomas Umbach, M.D., FACS
Dr. Umbach is a bariatric surgeon whose entire practice is devoted to performing
Before relocating in Southern Nevada, Dr. Umbach started the laparoscopic
surgical weight loss program at Kaiser Permanente South San Francisco
and created a similar program in Eugene, Oregon, that earned accreditation
as a center of excellence.
Dr. Umbach graduated from Virginia Commonwealth University School of Medicine,
completed his residency at Kaiser Permanente in Los Angeles and was fellowship
trained in advanced minimally invasive surgery at the University of Southern
He is a fellow of both the American Society of Metabolic and Bariatric
Surgery and the American College of Surgeons. He is also a member of the
American Board of Surgery.
Dr. Umbach, who is married with two children, enjoys traveling, camping
and reading. He is also a licensed pilot who loves to fly when he can
find the spare time.