Read More About Your Health Care Provider in Arlington Heights, IL Below


Murray Propes, M.D.

Dr. Propes received his medical degree from Southern Illinois University School of Medicine, Springfield, Illinois in 1999.  Prior to that, he studied at the University of Illinois, Urbana-Champaign where he received his master’s degree in Biology. His internship and residency were also completed at the University of Illinois.  He is board-certified in Internal Medicine.  In his free time, Dr. Propes’ hobbies include cycling, travel, and gardening.

Health Care Providers

James D. Pride, M.D.

Dr. Pride received his medical degree from the University of Illinois Medical School. He completed his residency at Lutheran General Hospital. Dr. Pride is Board certified in Internal Medicine. He has received an AMA Physician Recognition Award. Dr. Pride also serves as an FAA medical examiner. His personal interests include golf and tennis. Dr Pride is the Vice President of the Jeffrey Pride foundation, which raises money for pediatric cancer research. This is an all-volunteer organization that has raised over 2 million dollars for clinical research.


Eric J. Yegelwel, M.D.

Dr. Yegelwel received his medical degree from the New Jersey Medical School. He completed his residency at the University of Illinois Hospital. Dr. Yegelwel completed a Fellowship in Gastroenterology at the Loyola University Medical Center/Hines Veterans Administration Hospital. He is Board certified in Internal Medicine and Gastroenterology. Dr. Yegelwel served as the Chief of the Gastroenterology Section at Northwest Community Hospital. He has authored two articles in The American Journal of Gastroenterology and The Journal of Digestive Diseases and Sciences. Dr. Yegelwel enjoys running, reading, taking trips with his family, and walking his dog.

Health Care Providers

Diane M. Flershem, M.D.

Dr. Flershem received her medical degree from Rush Medical College. She completed her internal medicine residency at Northwestern Memorial Hospital. She also studied anesthesiology at New York Hospital-Cornell University before continuing on as a health care provider in Arlington Heights, IL. Dr. Flershem is Board certified in Internal Medicine. She has earned an Honors College Scholarship for Research Investigation and is an author of one article published in Lancet. Dr. Flershem received the Patients Choice Award in 2008, 2009 and 2010. Only 4-5% of doctors nationwide receive this award. She also received the Compassionate Doctor Award for 2010 where only 3% of nation’s physicians were honored. Dr. Flershem loves zoos, her two dogs, and going on trips to New York and Arizona with her friends.


Jason B. Thalheimer, M.D.

Dr. Thalheimer is a board certified physician, specializing in internal medicine. He grew up locally in Arlington Heights, IL. He travelled downstate for college where he attended the University of Illinois in Champaign. After graduating, he moved on to medical school at Rosalind Franklin University in North Chicago, and then completed his Internal Medicine residency at Lutheran General Hospital. Dr. Thalheimer is a big sports fan and enjoys cheering on Chicago’s teams. His personal interests include playing basketball and softball, attending movies and trivia nights, and reading.


Tyler Kostecki, PA-C

Tyler Kostecki joined our practice in July 2017. He received his Master’s Degree in Physician Assistant Studies from Marquette University. He first received his Bachelor’s Degree in Biological Sciences from Illinois State University, graduating summa cum laude. Tyler’s personal interest include running and cycling along the Lakefront trail, Chicago pro sports (Cubs, Bears, Bulls), ISU football, and Marquette basketball.


David Rosen, M.D.

Dr. David Rosen earned his medical degree from Rush Medical College in Chicago, Illinois. Subsequently, he completed his residency in internal medicine at Rush University Medical Center and served as Chief Resident at Rush/Rush North Shore Medical Center in Skokie, Illinois. He is board certified in internal medicine. Dr. Rosen then became board-certified in emergency medicine after completing a second residency in Cook County Hospital in Chicago. In 2005, he did a year-long preceptorship in phlebotomy, the study of medicine devoted to vein disease. He is board certified by the American Board of Venous and Lymphatic medicine. In his free time, he enjoys spending time with his wife and 3 kids, reading, cooking, playing the piano and traveling.

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