Advocate Lutheran General Hospital
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Bariatric and Metabolic Center
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Meet Our Staff

We understand what our patients are taking on, because we take it on with them. It is what makes us so confident that they can accomplish their health goals. And it helps to encourage and them, every step of the way.

At Advocate Lutheran General Hospital, we feature a multidisciplinary team of highly qualified practitioners who specialize in treating metabolic diseases, working with thousands of patients every year. In addition, several members of our team have firsthand experience with the surgical procedures, weight management programs and the journey our patients undergo.

Jennifer Debruler, M.D.
Medical Doctor

Board certified in internal medicine and a board certified obesity medicine physician from the American Board of Obesity Medicine, Dr. Debruler has been in practice since 1995. She received her medical degree from the University of Illinois at Chicago and served both an internship and residency at Advocate Lutheran General Hospital. Dr. Debruler has participated in research and presentations pertaining to women’s health and she is a member of the American College of Physicians and American Society of Bariatric Physicians. She specializes in weight management, women’s health and diabetes. Dr. Debruler brings a particular focus on preventative care and disease management to caring for every patient.

Jeffrey Rosen, M.D.
Bariatric Surgeon

Dr. Jeffrey Rosen is board certified in general surgery and has been in practice since 1993. He received his medical degree from the University of Illinois at Chicago, where he also served his residency. Dr. Rosen has performed thousands of weight-loss surgeries and regularly teaches bariatric surgery to surgeons around the country. He is an affiliate clinical instructor at the Midwestern University College of Osteopathic Medicine, and his research has been published in various medical publications, including the Journal of Trauma and Surgical Endoscopy. Dr. Rosen is a member of various medical associations including American Society for Metabolic and Bariatric Surgery and Society for American Gastrointestinal Endoscopic Surgeons.

Dr. Marin Marinov, M.D., FACS
Bariatric Surgeon

Dr. Marin Marinov is a board-certified general surgeon and has been in practice since 1996. He received his medical degree from the Higher Medical Institute in Plovdiv, Bulgaria. Dr. Marinov served his residency at University Hospital Queen Joanna in Sofia, Bulgaria, and a transplant surgery fellowship at the University of Illinois Medical Center. A clinical assistant professor at Rosalind Franklin University of Medicine and Science, Dr. Marinov’s has participated in various research projects, published numerous articles and presented research findings all over the world. He is a member of various medical associations including the Society of Critical Care Medicine and American College of Surgeons, in which he is a fellow.

Dr. Allen Mikhail, M.D.
Bariatric Surgeon

Dr. Allen Mikhail is a board-certified general surgeon with specialized training in advanced laparoscopic and bariatric surgery from the Cleveland Clinic. He has served as the primary investigator on many research grants and has published numerous papers, abstracts and book chapters related to nutrition, laparoscopic gastrointestinal and bariatric surgery. Dr. Mikhail is a member of many professional and scientific societies including the American College of Surgeons, Society of Laparoendoscopic Surgeons, American Society for Metabolic and Bariatric Surgery (ASMBS) and Society of American Gastrointestinal and Endoscopic Surgeons (SAGES). He has special interests in laparoscopic Roux-en Y gastric bypass, sleeve gastrectomy, gastrointestinal surgery, adjustable gastric banding and endoscopic procedures.

Adriana M. Guerrero MS, CPT
Exercise Physiologist

Adriana Guerrero is an exercise physiologist, ACE-certified personal trainer and ACSM health fitness specialist. She received her Bachelor of Science in Kinesiology from the University of Illinois at Chicago and her Master’s Degree in Clinical Exercise Physiology at Benedictine University. Her experience includes preparing patients for bariatric surgery, creating exercise programs for patients with metabolic conditions and patients in cardiac rehab.

Emily Schumann
Registered Dietitian, Licenced Dietitian Nutritionist

Emily Schumann is a registered dietitian and licensed dietitian nutritionist. She received her Master's of Public Health and Master's of Science in Nutrition and Wellness from Benedictine University where she also completed her dietetic internship. She completed her Bachelor's of Science in Food Science Human Nutrition from the University of Illinois in Champaign-Urbana. Along with working at the Bariatric Clinic, Emily also works as an inpatient clinical dietitian at Advocate Lutheran General Hospital, teaches classes at the Cancer Survivorship Center, and is a member of the Chicago Academy of Nutrition & Dietetics.


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