Program Leaders

Elizabeth Apolonio, MD

Dr. Apolonio is a graduate of the Medical College of Ohio. She undertook both her internal medicine residency and fellowship training in infectious diseases at Northwestern. As Section Chief of General Internal Medicine at Lakeside VA, her primary role is Director of the VA General Medicine Clinics and Life Support Unit.  She is currently helping spearhead the implementation of Advanced Clinic Access at the Lakeside in order to improve patient access to their provider. Dr. Apolonio believes strongly in the benefits of practicing evidence-based medicine and is involved in the monitoring of several quality of care indicators within the VA's computerized patient record system.


John Butter, MD
Associate Program Director

Dr. Butter graduated from Northwestern University's Feinberg School of Medicine, completed his residency at Beth Israel Hospital in Boston, and worked on the faculty at Dartmouth Medical School before returning to Northwestern in 1997. In addition to overseeing the ambulatory education for the residents, John is the Medical Director of the Clinical Education Center. He enjoys teaching at the bedside, working to enhance physical diagnosis skills and caring for challenging patients.


Vinky Chadha, MD

Dr. Chadha is a graduate of Northwestern's Honors Program in Medical Education and also completed his residency in Internal Medicine at Northwestern. He lends his considerable knowledge and experience to his role as Co-Director of the Junior Medicine Clerkship. His enthusiasm, knowledge and humor have made a popular mentor and a valuable resource for the residents.


Angelo Costas, MD

After completing residency and Chief Residency at Northwestern, Dr. Costas was asked to serve as one of our earliest Firm Chiefs. He currently practices general internal medicine, frequently attends on the inpatient wards and spends every Thursday taking  morning report. Highly regarded for his broad knowledge base and exemplary rapport with patients and residents, he is a role model and mentor for our residents, especially those interested in careers in general internal medicine.


Aashish Didwania, MD
Associate Program Director

Dr. Didwania graduated from the University of Michigan medical school and from Northwestern's residency in 2005.  He served as a chief medical resident during the academic year 2005-2006.  Dr. Didwania is currently a faculty member in the Division of General Internal Medicine.  He has been involved in several quality improvement projects as well as a chart review looking at the effects of our training programs in medical simulation.  Dr. Didwania brings his enthusiasm and energy to the residency program where he is known as a thoughtful leader and excellent teacher.


Nancy Dolan, MD
Co-Director, Women's Health Track

Dr. Dolan is a graduate of the University of Michgan Hospitals residency program in internal medicine.  She is currently co-director of the Women's Health track and a member of the Division of General Medicine.  As she also directs the ambulatory block rotation and has active research interests in ambulatory settings, Dr Dolan is uniquely qualified to oversee these important components of the residency program.

Dan Evans, MD

Dr. Evans came to Northwestern in 1996 as a first year medical student and has been happily here ever since, staying on as a chief medical resident in '03-'04.  He is currently a faculty member in the division of General Internal Medicine and splits his time equally between hospital medicine and outpatient practice.  Being a "hybrid" hospitalist/generalist, he has a special interest in studying transitions of care and discharge safety.  Dr. Evans is also well known to many residents in his capacity as the clerkship director for 4th year medical subinterns.


Robert Hirschtick, MD

Dr. Hirschtick is a faculty member in the division of Infectious Disease and the Director of the Third Year clerkship in Medicine at the VA hospital.  His area of clinical interest is HIV medicine.  Dr. Hirschtick is an astute clinician and a wonderful teacher and mentor to both students and residents.


David Liebovitz, MD
Associate Program Director

Dr. Liebovitz completed his residency training at the University of Chicago where he worked as a clinician educator until 2002. Dr. Liebovitz is currently the Medical Director for Clinical Information Systems at Northwestern Memorial Hospital and serves as the informatics liaison for the Department of Medicine working to streamline operations for housestaff and maximize their learning opportunities.


Stevie Mazyck, MD
Associate Director, Hospitalist Track

Dr. Mazyck is a full time faculty member in the Division of General Internal Medicine.  He graduated from the Medical University of South Carolina.  He tremendously enjoys his role as a Hospitalist.  Since his chief resident year, he has been actively involved in the education of medical residents and students.  He serves as a course director for the Clinical Skills Course for second year medical students and associate director of the Residency Program Hospitalist Track.  Dr. Mazyck enjoys working with students and residents at all levels of training; he volunteers his time working with students in a community free health clinic.


Arvydas Vanagunas, MD

Dr. Vanagunas served his residency and fellowship in gastroenterology at Northwestern. As an active subspecialist within the division of Gastroenterology, he maintains his roots in internal medicine.  He has been a leader in resident education during the weekly, dynamic Firm Conference and as a subspecialist role model on consult rotations.


Warren Wallace, MD
Associate Program Director

A graduate of the University of Michigan Medical School, Dr. Wallace developed an interest in general internal medicine while a resident and chief resident at Northwestern. As a member of the Division of General Internal Medicine, he emphasizes the central role of the general internist in coordinating the patient's care. Dr. Wallace brings an emphasis on continuity of care and close working relationships among attending staff members, patients, and residents to the clinical service. In addition he encourages critical thinking in forums such as Resident Board Review and Morning Report.

Diane B. Wayne, MD
Program Director

Dr. Wayne is a graduate of Northwestern University's Feinberg School of Medicine.  As a faculty member in the division of General Internal Medicine, her interest in resident education led to the development of new rotations and curricula for Internal Medicine residents.  Her creation of a simulation based education in ACLS and procedural skills have led to more than 10 publications and The Society of General Internal Medicine Innovations in Medical Education Award.  Her enthusiasm permeates her leadership.