Department of Internal Medicine Leadership Team

The Department of Internal Medicine is led by many nationally and internationally respected experts.

Department leaders

Jochen Reiser, MD, PhD

Sumant Chugh, MBBS, MD
Vice Chairperson, Strategy and Development

Scott Hasler, MD
Vice Chairperson, Education

Vineet Gupta, PhD
Vice Chairperson, Research

Monnie Wasse, MD, MPH
Vice Chairperson, Quality and Patient Safety

Suja Mathews, MD
Department Liaison for Stroger Hospital

Brian Stein, MD
Director of Operations

Alan Harris, MD
Director of Academic Affairs

Scott Hasler, MD
Director of Residency Program

Division chiefs and administrators

Allergy & Immunology

Mary C. Tobin, MD
Division Chief


Kim A. Williams, Sr., MD, FACC
Division Chief

Digestive Diseases 

Ali Keshavarzian, MD
Division Chief

Endocrinology and Metabolism

Brian Kim, MD

Division Chief

General Internal Medicine

Daniel Dunham, MD, MPH
Division Chief

Geriatrics, Gerontology and Palliative Medicine

Sean O’Mahony, MD
Interim Division Chief

Hematology, Oncology and Cell Therapy

Timothy Kuzel, MD
Division Chief

Hospital Medicine

Suparna Dutta, MD, MS, MPH
Division Chief

Infectious Diseases

Gordon Trenholme, MD
Division Chief

Nephrology and Nephrology Transplantation

Vasil Peev, MD
Interim Division Chief

Pulmonary, Critical Care Medicine and Sleep Medicine

Robert Balk, MD
Division Chief


Joel Block, MD
Division Chief