Meet Our Team

The Chicago Center for Bariatric Surgery is led by our expert multidisciplinary team. We are here to help you lose excess weight, keep it off and improve your overall health! We are committed to helping you make your weight loss a permanent success through education, support and follow-up care.

Frederick M. Tiesenga, M.D. is the Medical Director of The Chicago Center for Bariatric Surgery & Medical Weight Loss and President of New Hope Surgical Weight Loss Center, S.C. He received his medical degree from the University of Illinois College of Medicine and performed his residency clinical training at Metropolitan Group Hospitals in Chicago. Fellowship-trained in laparoscopic gastric bypass, Dr. Tiesenga is an affiliate surgeon of the American Society of Bariatric Surgeons and a Covidien Proctor for Bariatric Surgery.
Scott A. Reishus, D.O.​, received his medical degree from The Chicago College of Osteopathic Health Systems and completed his medical residency at Midwestern University. He then went on to conduct a fellowship in Vascular Surgery as well as advanced training in advanced laparoscopic procedures and endovascular surgery.
Alexander Knijnikov

Alexander Knijnikov, D.O., received his medical degree from New York College of Osteopathic Medicine, and completed residency programs at Flushing Hospital Medical Center, and Peninsula Hospital Center in New York. Dr. Knijnikov then went on to complete a Minimally Invasive, Bariatric, and Robotic Surgery fellowship at Winthrop University Hospital.

Bariatric Program Coordinator​, Julianne Rizzo, has over 17 years of nursing experience and has been involved in the program since its inception in 2002. Julianne assists all patients in achieving their goals by guiding them through every step of the bariatric process. She can be reached by calling (708) 763-6398 or by emailing assists all patients in achieving their goals by guiding them through every step of the bariatric process.
Advanced Practice Nurse​, Christina I. Crews, NP-C, is a board-certified nurse practitioner. She graduated cum laude at West Suburban College of Nursing and received her master's degree from North Park University. As the program's Advance Practice Nurse, Christina helps patients throughout the journey to living lighter. Christina provides pre- and post-surgical education, helps patients understand the various surgical techniques and aides in surgery, recovery and post-operative management.
Bariatric Patient Coordinator, Sherry Goldie-Horvath​, navigates patients through the pre-operative and post-operative follow-up processes. With more than seven years of experience, Sherry provides a wealth of knowledge pertaining to the insurance verification process.

Registered Dietitian, Sherri Brennan, R.D., L.D.N., provides patients with the nutrition and exercise tools to assist them in managing their diet and identifying food triggers to remain successful in their journey to a NEWU. In addition, she assists patients with pre-operative and post-operative nutritional counseling.

Meet our team by registering for a FREE Information Session. Call (708) 763-NEWU (6398) for more information.