Dr. Yijun Chen

Dr. Billy is the leading Lap-Band, laparoscopic gastric bypass and laparoscopic gastric sleeve surgeon in Ventura and Santa Barbara County. Dr. Billy relocated his practice to Ventura in July of 2002. Prior to that he had established himself as one of the premier laparoscopic surgeons in the Sacramento and Sierra Nevada region of Northern California. Dr. Billy was instrumental in developing the bariatric surgery centers at Sutter General Hospital and Sutter Roseville Medical Centers. He is currently 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. St. Johns Regional Medical Center is located in Oxnard California. Dr. Billy also serves as the Medical Director of the Community Memorial Hospital, a Surgical Review Corporation accredited Bariatric Center of Excellence, located in Ventura, California. Dr. Billy obtained his undergraduate degree in Molecular Biology at the University of California, Berkeley. He subsequently received his medical degree at the University of California, Davis School of Medicine. Dr. Billy received additional training in the techniques of the Lap-Band system prior to its release by the FDA in 2001. He is actively involved as a teaching faculty member for placement of the Lap-Band® system and has educated and proctored dozens of surgeons throughout the west as part of their educational training. Dr. Billy has been a faculty member at numerous national educational events and surgeon training workshops. He has been a featured speaker at the annual meeting of the American Society of Metabolic and Bariatric Surgery and was a contributing author on the recently released SAGES Bariatric Surgery Manual published by the Society of American Gastrointestinal and Endoscopic Surgeons. Dr. Billy has an international reputation and has lectured and taught principles of bariatric surgery in Mexico, Taiwan and India.Offers high-quality, individualized care with compassion. Believes communication and collaboration with patients is the foundation for effective relationships. Through effective education, patients are empowered to partner in their care and achieve their health goals.In May 2022 Dr. Billy was elected to the American Society for Metabolic and Bariatric Surgery Council, the largest and most prestigious National Society for metabolic and bariatric surgery.The executive council consists of 8 ASMBS members who represent the leadership of the National Society.The vision of the society is to improve public health and well being by lessening the burden of the disease of obesity and related diseases throughout the world. Dr. Billy is rated as a Distinguished provider by MediFind in Sleeve Gastrectomy. His top areas of expertise are Obesity, Malabsorption, Hiatal Hernia, Gastrectomy, and Sleeve Gastrectomy.

Dr. H. Joseph Naim received his Bachelor of Science in Biology from University of Southern California in Los Angeles, and received his Medical Degree from Mount Sinai School of Medicine in New York City with a distinction in Research. He completed his residency in General Surgery at New York Methodist Hospital in Brooklyn, N.Y., where he was Chief Resident during his final year. Dr. Naim completed his Fellowship in Minimally Invasive Bariatric Surgery at University Medical Center at Princeton, N.J., under the direction of world renowned bariatric surgeon Robert E. Brolin, MD.I try to communicate with my patients. I strive to explain their medical condition and discuss their treatment options in plain language. Questions are answered. I want no patient to leave the office thinking they were rushed through their visit. Dr. Naim is rated as an Advanced provider by MediFind in Sleeve Gastrectomy. His top areas of expertise are Obesity, Obesity in Children, Hiatal Hernia, Sleeve Gastrectomy, and Gastrectomy.

Malgorzata Stanczyk is a General Surgeon and a Bariatric Medicine provider in Long Beach, California. Dr. Stanczyk is rated as an Advanced provider by MediFind in Sleeve Gastrectomy. Her top areas of expertise are Obesity, Obesity in Children, Food Allergy, Sleeve Gastrectomy, and Gastrectomy. Dr. Stanczyk is currently accepting new patients.