Centegra Healthy Living Institute
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Surgery Team


Headed by specially trained surgeon and medical director Amir Heydari, MD, this team includes physicians, nurses, psychotherapists, exercise physiologists and dietitians who have a singular interest in the problems caused by morbid obesity. The team combines a surgical approach with mental health support, nutritional education and physical activity to enhance weight loss. We work together to provide you quality care, genuine respect, passionate caring and a joyful spirit.

Amir J. Heydari, MD, FACS

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Dr. Amir Heydari is passionate in his belief that the disease of obesity and the alarming rise in individuals who are overweight demand the attention of the community, as well as the expertise of medical specialists to treat this serious ...

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Dr. John R. Cheregi, MD

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Dr. John Cheregi is a General and Bariatric surgeon at Centegra Hospital Woodstock and McHenry. He is Board Certified by the American Board of Surgery. He completed his fellowship in Advanced Laparoscopy and Bariatric Surgery in Iowa City, IA in ...

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Susie Dirkx, RN, BS, CNOR, Bariatric Coordinator

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Susie has been a part of the Weight-Loss Surgery program since 2002 when she was the Team Leader at Centegra Hospital – McHenry. For the past three years, Susie has been the Bariatric Coordinator and brings together all facets of patient ...

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Betsy Felde RD, LDN

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Betsy is a Registered Dietitian and Licensed Dietitian Nutritionist at the Centegra Weight-Loss Surgery Center. Betsy received her Bachelors of Science from Indiana University with a minor in Psychology.  She also completed an internship from Indiana University-Purdue University Indianapolis School of ...

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