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Meet our residency leaders and faculty

Our faculty members share a passion for education and patient care. You’ll feel this passion in our supportive learning environment as we help you continue your medical education and achieve your learning, research and career goals.

Interim Program Director

John Conzemius, MD

Portrait of doctor John Conzemius.

Originally from central Minnesota, Dr. Conzemius has been at Gundersen for over 20 years. He completed his Internal Medicine Residency at Gundersen in 2003 after graduating from the University of Minnesota School of Medicine. Dr. Conzemius has been involved in both inpatient and outpatient medical student and resident education throughout his career at Gundersen. He served as associate program director for the Transitional Year Residency Program from 2021 until stepping into the role of interim program director for the Internal Medicine Residency in 2024. 

Dr. Conzemius also maintains a busy Internal Medicine primary care practice, serves as a rotating attending for the Inpatient General Medicine teaching service and is an attending for the Internal Medicine Residency Continuity Clinic. 

In his spare time, he enjoys all that the La Crosse area has to offer with hiking, biking, golfing, skiing, snowshoeing, boating and attending theatre and musical productions. 

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Associate program director

Michael Witcik, MD, FACC


Dr. Michael Witcik grew up in Northern Wisconsin and graduated from the University of Wisconsin-Madison School of Medicine and Public Health. He is a cardiologist with interests in valvular heart disease and percutaneous therapies, advanced echocardiography and cardiac MRI. He has five kids and enjoys outdoor activities and sports, such as hiking, camping, skiing, basketball and hockey.

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Associate Program Director

Thomas Leece, MD


Dr. Tom Leece is an associate program director of the Internal Medicine Residency at Gundersen. He works as a hybrid physician covering both inpatient and outpatient medicine patients at Gundersen. He is an avid music fan and enjoys building his record collection, sharing this hobby with his four children. He and his family are also avid skiers during the winter months.

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Core faculty and staff

Derek Hupp, MD

Aiman Riaz, MD

Fatima Anum, MD

Internal Medicine Chief Resident  

Cindy Leitz, C-TAGME

Internal Medicine Residency administrator

(608) 775-1910 


Elizabeth Parent

Internal Medicine Residency assistant


Family life during your residency

Why Gundersen

Aerial view of la crosse, wisconsin.

Call La Crosse Home

We have it all in La Crosse, Wis. Our vibrant city and region support your dream lifestyle with a welcoming community, culture and outdoor adventure.

Explore La Crosse
Single family home near Gundersen's campus.


Steps from our flagship medical center in La Crosse, our housing options allow you to enjoy the company of your family and the comradery of your colleagues.

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Residents kayaking the Kickapoo river.

Prioritizing Your Wellness

As you learn how to become the clinician you aspire to be, we’ll provide space to prioritize your mind and body wellness, and reach the work-life balance you need.

Wellness opportunities
Contact our team

We’re here to answer your questions about our residency program.

Email us

1900 South Ave.
La Crosse, WI 54601

(608) 782-7300

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