Your support team.

Grinnell Center of Excellence Staff and Affiliated Staff


David D. Coster, MD, Medical Director of Grinnell Bariatrics and Bariatric Surgeon - Grinnell Bariatrics

Dr. Coster leads the bariatric program with more than 20 years of experience caring for bariatric patients. He performs open and laparoscopic gastric bypass, laparoscopic sleeve gastrectomy, and complex revision procedures. Dr. Coster is experienced in all areas of general surgery and has a special interest in skin reconstruction after weight-loss from surgery for obesity. Dr. Coster has two board certifications: General Surgery and Critical Care.


Mathew W. Severidt, DO, Bariatric Surgeon - Grinnell Bariatrics

Dr. Severidt joined Grinnell Bariatrics and Surgical Associates in July 2012. Dr. Severidt provides expert care in general surgery, minimally invasive surgery, and bariatric procedures including laparoscopic sleeve gastrectomy, laparoscopic gastric bypass, and revision procedures. Dr. Severidt has a special interest in Critical Care Medicine and Surgery. Dr. Severidt is board certified in General Surgery.


Stefanie H. Noun, PA-C, Bariatric Program Director - Grinnell Bariatrics

Ms. Noun is a board-certified physician assistant with extensive experience in medicine and psychiatric care. Noun directs and integrates the bariatric program for Surgical Associates and Grinnell Regional Medical Center. Noun sees patients in the office and hospital. She provides medical care, education, and long term follow-up for our patients. 


Jarrod Phelps, PA-C - Grinnell Bariatrics

Mr. Phelps is a board-certified physician assistant with experience in bariatric and general surgery procedures. He assists the surgeons in the operating room during bariatric surgeries. He also provides follow up with patients in the hospital and office. 


Bridget Baechtel, LISW - Grinnell Bariatrics

Ms. Baechtel provides group, individual, and family psychotherapy for the bariatric program as well for the local and state wide community. She received her undergraduate degree and her master’s degree in Social Work from the University of Iowa. Baechtel belongs to the Academy for Eating Disorders, the National Association of Social Workers, and the the Post Traumatic Stress Disorder Academy.


Jamie Brennan - Grinnell Bariatrics

Ms. Brennan graduated from Kirkwood Community College with a degree in health information technology and medical coding. She has been at Surgical Associates since 2010. She works closely with the surgeons, healthcare professionals, and insurers both pre and post operatively to prepare patients for surgery. 


Jennifer Paisley, MD Internal Medicine and Pediatrics Medical Director for Bariatrics - Affiliated Staff

Dr. Paisley serves as the internal medicine specialist and pediatric medical advisrr for the Bariatric Center of Excellence. She is board certified in Obesity Medicine and specializes in the comprehensive medical care for adults and children with obesity.  She provides comprehensive medical care for pediatric patients of the program as well as diagnostic and treatment care to bariatric patients admitted to the program.

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Michelle Brennan, RD, LD, Dietitian - Affiliated Staff

Ms. Brennan specializes in weight loss, bariatric surgery and heart health. She has a special interest in incorporating nutrition into overall wellness and health promotion. 

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Dori Pearce, Wellness & Fitness - Affiliated Staff

Ms. Pearce hosts the quarterly support group sessions and visits with patients in the hospital to develop a fitness and wellness program for patients. 


Emily Vesely, RN, Care Coordinator - Affiliated Staff

Ms. Vesley ensures that the patient has all that they need before and after surgery for a safe and successful recovery. She has nursing experience in medical/surgical, obstetrics, intensive care unit and surgery. 


Linda Romero, LISW, Social Worker - Affiliated Staff

Ms. Romero helps patients with issues regarding the adjustment to weight loss and the impact on emotional and social well-being.


Stacey Simbro, RN - Grinnell Bariatrics

Ms. Simbro graduated from Mercy College of Health Science with an associate’s degree in nursing in 2005. She has worked in surgery since 2005. She has been employed with Surgical Associates since September 2011.