Daniel Bacal, MD 
Medical Director of the Oakwood Bariatric Program
Oakwood Hospital & Medical Center, Dearborn

Dr. Bacal received his Medical Degree from the Universidad Central de Venezuela. He ranked first out of 163 students and received an award for Excellency. Dr. Bacal was fellowship-trained in minimally invasive surgery at the IRCAD/European Institute of Telesurgery, University Louis Pasteur in Strasbourg, France. Dr. Bacal was also an instructor of laparoscopic, minimally invasive surgery and bariatrics for surgeons training during his fellowship. He completed his internship and residency at St. Joseph Mercy Hospital in Ann Arbor. Dr. Bacal is board certified with the American Board of Surgery and is member of the American Society of Bariatric Surgery. He has received numerous certifications and has researched and written various publications. Dr. Bacal’s philosophy is to put the patient first, provide physical and emotional comfort, and strive for the highest care possible. His approach is to bring the newest technologies and best treatments to patients.
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Edward Mavashev, MD
Bariatric Surgeon
Oakwood Annapolis Hospital, Wayne

Dr. Mavashev is a fellowship trained bariatric surgeon from the University of Pittsburgh Medical Center. He completed his internship and residency at SUNY Downstate Medical Center in Brooklyn, New York. Dr. Mavashev specializes in minimally invasive bariatric weight-loss surgery, which has advantages over conventional surgery, including shorter hospital stay, quicker recovery time, less pain, less scarring and much smaller incisions. He holds privileges at Oakwood Hospital & Medical Center in Dearborn.
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Terry Marentette, RN
Bariatric Coordinator

Terry attended Eastern Michigan University, Michigan State University, and Mercy School of Nursing in Detroit where she obtained a Diploma in Nursing. She has extensive experience in Bariatrics. As Bariatrics Coordinator at Oakwood Healthcare System, Terry is responsible for developing the bariatric program to include education, in-services, pre-admission testing, and consultation. She understands what prospective patients are feeling first-hand and offers detailed information and support to help with decisions. Terry underwent gastric bypass surgery in 1997 and to date has lost more than 135 pounds, which she’s successfully maintained for the last 14 years.
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Lindsey Guerriero, RD
Bariatric Nutritionist

Lindsey received her Bachelor’s of Science degree in Food Science & Nutrition at Wayne State University where she completed the Coordinated Program in Dietetics in 2008 and is credentialed through the Commission on Dietetic Registration. She provides medical nutrition therapy services to patients in the Bariatric Program. She is involved in the patient education program prior to surgery, on-going nutritional support, as well as one of the support group leaders. She also provides services through the Medical Weight Loss Program. She believes in guiding the patients not only from a Bariatric surgery standpoint, but to also bring out their best potential to live a healthier and more active lifestyle. Lindsey is a member of the American Society for Metabolic and Bariatric Surgery, the Michigan Bariatric Society and the American Dietetic Association.