Stephen Hazelrigg, M.D.,is Professor and Chairman of the Division of Cardiothoracic Surgery at the Southern Illinois University School of Medicine. Hazelrigg practices all aspects of cardiothoracic surgery (heart, lung and esophageal) and has a special interest in thoracoscopic surgery. shazelrigg@siumed.edu

Carl Arentzen, M.D. . Carl Arentzen is an associate professor of cardiothoracic surgery at Southern Illinois University School of Medicine. He practices all aspects of cardiothoracic and vascular surgery. carentzen@siumed.edu

Theresa Boley, RN, MSN, FNP-CS, is an assistant professor of surgery in the Division of Cardiothoracic Surgery at the Southern Illinois University School of Medicine. Ms. Boley is listed in multiple Who's Who publications and serves as a reviewer and consulting editor for numerous nursing journals. tboley@siumed.edu

Anthony L. Grasch, PA-C, has been a clinical instructor in the Division of Cardiothoracic Surgery at the Southern Illinois School of Medicine since 1993. Mr. Grasch received his bachelor's degree in Biology from Marquette University in Milwaukee, Wisc. in 1977. agrasch@siumed.edu

William G. Pyle, M.D. William Pyle is an Associate Professor of cardiothoracic surgery at Southern Illinois University School of Medicine. He practices all aspects of cardiothoracic and vascular surgery. Dr.Pyle earned his bachelor's degree from Southern Illinois University in 1978 and his medical degree in 1981 from SIU School of Medicine. wpyle@siumed.edu

Tilitha Shawgo, RN,APN, MS, is a clinical instructor and certified critical care nurse specialist in the Division of Cardiothoracic Surgery, Department of Surgery at Southern Illinois School of Medicine. tshawgo@siumed.edu

William Stevens, M.D. William Stevens is an associate professor of cardiothoracic surgery at Southern Illinois University School of Medicine. He practices all aspects of cardiothoracic and vascular surgery. wstevens@siumed.edu

Christina Vassileva, M.D.is an Assistant Professor of Cardiothoracic Surgery at the Southern Illinois University School of Medicine.  She received her training at the Brigham and Women’s Hospital in Boston, a teaching affiliate of Harvard Medical School.  While she practices all aspects of cardiothoracic surgery, she specializes in minimally invasive valve surgery, including mitral valve repair.  In addition, she has a particular interest in the treatment of women with valvular heart disease. cvassileva@siumed.edu

Wes Zwiefel, PA-C is a Physician Assistant, Wes just completed his training at Philadelphia University . wzweifel@siumed.edu

Robert S. Mocharnuk, MD Medical Director Division of Hematology/Oncology Associate Professor of Clinical Medicine Specializes in breast cancer and genitourinary cancers, as well as non-malignant bleeding and clotting disorders.

Aziz U. Khan, MD Division of Hematology/Oncology Associate Professor of Clinical Medicine Dr. Khan is an educator for the Advanced Nurse Practitioners and Medical Residents in the Division of Hematology/Oncology.

Meghna Desai, MD Division of Hematology, Oncology Assistant Professor Dr. Desai is an assistant Professor in the Division of Hematology Oncology in the Department of Internal Medicine at SIU School of Medicine.

Krishna Rao, M.D.,Ph.D is an Assistant Professor of Clinical Medicine with the Department of Internal Medicine, Division of Hematology and Oncology at Southern Illinois University School of Medicine and SIU Physicians and Surgeons.