Meet Our Physicians

Meet The Physicians

Physicians associated with The Center for Surgical Weight Loss @ North Vista Hospital include:

Bernie Hanna, M.D., FACS
Medical Director

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 weight-loss surgeries.

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 California.

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.