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CALIFORNIA/NEVADA CHAPTER ASMBS

Our Board

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President

Kamran Samakar, MD, FAFMBS, FACS

Director of Metabolic & Bariatric Surgery at Keck Medicine USC and Director of Pediatric Bariatric Surgery at Children's Hospital Los Angeles

Keck Medicine of USC

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Vice President

Victoria Lyo, MD, FACS

A clinical, academic bariatric and foregut surgeon, and NIH-funded Building Interdisciplinary Research Careers in Women's Health (BIRCWH) K12 scholar.  Currently studying Sex Differences in Bariatric Surgery and interest in non-invasive means to measure MASLD response to bariatric surgery.

UC Davis

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Secretary

Yijun Chen, MD 

Dr. Yijun Chen is a Health Sciences Associate Clinical Professor in the David Geffen School of Medicine at UCLA.

He completed his general surgery residency training at Stanford University, and a bariatric fellowship at Duke University

UCLA

Kulmeet Sandhu

Treasurer

Kulmeet Sandhu,

MD, ABOM

Associate Professor of Surgery and the Associate Director of Minimally Invasive and Bariatric Surgery at Cedars-Sinai Medical Center. Also serving as Director of the Advanced Gastrointestinal Minimally Invasive/Bariatric Surgery Fellowship and Medical Director of the Surgical Simulation Center.

Cedars - Sinai

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Past President

Pearl Ma, MD, FASMBS, FACS, DABS-FPMBS

UCSF Fresno Resident Excellence in Teaching Award, Leon S Peters Foundation Resident of the Year Award, ASMBS Distinguished Service Award, and Treatment of Obesity and Research (TREO) Foundation 2023 Rising Star Award

Advanced Laparoscopic Surgical Associates/ Community Health Partners

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Board Member

Alexander Ayzengart,

MD, MPH, FASMBS, FACS

A board-certified robotic bariatric and gastroesophageal surgeon and a clinical assistant professor of surgery at the University of Nevada, Reno School of Medicine. Formerly a lieutenant commander, serving as staff surgeon and a department head in the US. Navy Medical Corps.

Renown Health

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Board Member

Helmuth Billy, MD

Director of Bariatric Surgery at St. John’s Regional Medical Center, a recognized bariatric Center of Excellence by the Surgery Review Committee, Medicare, Blue Cross, Blue Shield and Health Net, and Medical Director of the Community Memorial Hospital. 

Ventura Advanced Surgical Associates

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Board Member

Erik Simchuk, MD

Medical Director at Enloe Health Bariatrics. 

Enloe Health Bariatric & Metabolic Services

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Board Member

Brain Smith, MD

Comprehensive benign and malignant foregut surgeon, and perform primary and revisional bariatric surgery. I practice at both UC Irvine Medical Center and VA Long Beach Healthcare System.

UCI Health

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IH Member

Katie Chapmon,

MS, RD

A registered dietitian nutritionist specializing in bariatric nutrition, GI issues, and hormonal health. She has more than 17 years of hands-on clinical experience with leading medical providers and individual clients. 2010 Recognized Young Dietitian of the Year and 2018 Excellence in Practice.

Katie Chapmon Nutrition

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STAR - California

Adrian Dobrowolsky, MD, FACS

Director of the Bariatric Weight Loss Prrogram at Hoag. Specializes in minimally invasive surgery for weight loss and diseases of the esophagus and stomach using laparoscopic and robotic methods.

Hoag Physician Partners, Hoag Specialty Clinic

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STAR - Nevada

Morgan Pomeranz, MD, FASMBS, FACS

Board-certified surgeon, specializing in advanced laparoscopic and robotic surgery, including weight loss, anti-reflux, hernia/abdominal wall, and general surgery in Las Vegas, Nevada.

Dignity Health Bariatrics

© 2026 California/Nevada Chapter American Society for Metabolic & Bariatric Surgery

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