Meet The Physicians
Physicians associated with North Vista Hospital include:
Bernie Hanna, M.D.,
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.
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.
Mustafa Ahmed, M.D. , FACS
Dr. Mustafa Ahmed graduated from Ohio State University College of Medicine
and Public Health before doing an internal medicine residency at Mount
Carmel Medical Center, Columbus Ohio.
Dr. Ahmed has certifications with the American Board of Surgery, Surgical
Critical Care, Advanced Cardiac Life Support and Advanced Trauma Life Support.
The experience he had as an internist ultimately led him to finish with
a Bariatric Fellowship. The most common denominator with patients who
suffer from diabetes, high blood pressure, coronary artery disease, osteoarthritis,
and other life debilitating diseases is often obesity. Dr. Ahmed believes
that in order to treat and improve a patient's overall health you
have to address the obesity.
Dr. Ahmed's practice is centered on patient care and empowering patients
who suffer from Obesity. "Until we treat obesity, we can only chase
the diseases that are associated with it."
On a personal note, he is married with five boys. One of the passions they
have as a family is spending time together hiking, swimming, and playing soccer.
Francis Teng, M.D, FACS
Dr. Teng received his medical degree in 1991 from the University of NV
School of Medicine, Reno, NV. He is a diplomat of the American Board of
Surgeons, Society of Laparoendoscopic Surgeons Member, and a member of
the American Society of Metabolic and Bariatric Surgeons.
Dr. Teng is board certified in general surgery and has been practicing
bariatric surgery since 2002. He specializes in advanced laparoscopic
procedures and general surgery.