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Meet the fellows


 Sean O'Neil, MD

BS: University of Wisconsin-La Crosse (Biology& Spanish)
MD: Medical College of Wisconsin
Residency: Gundersen Health System

Christopher D Walden, MD, PhD

BS: University of North Dakota (Biology)
PhD: University of North Dakota (Biochemistry &Molecular Biology)
MD: University of North Dakota School of Medicine and Health Sciences
Residency: Gundersen Health System


Jordyn Kreutzfeldt, MD

Jordyn Kreutzfeldt, MD

BA: University of South Dakota (Medical Biology)
MD: University of South Dakota, Sanford School of Medicine
Residency: University of AZ, Tucson

Garrett Weber, MD

Garrett Weber, MD

BS: University of Nebraska, Lincoln (Biological Sciences)
MD: University of South Dakota, Sanford School of Medicine
Residency: Gundersen Health System


Michael Lehner, MD

BA: Purdue University (Biomedical Engineering)
MD: McGovern Medical School at the University of Texas Health Science Center
Residency: McGovern Medical School at the University of Texas Health Science Center

Aquino Williams, MD

BA: SUNY Farmingdale
MD: St. Georges University
Residency: Hackensack University Medical Center

The best of both worlds. I chose Gundersen because of the unique blend of academic medicine and community practices, while also working alongside a faculty that not only cares about our professional growth but our personal growth as well.


2024 alumni

Yacki Hayashi-Tanner, DO
Hematologist/Medical Oncologist
Gundersen Health System, La Crosse, WI

Emily Westergard, DO
Community Oncology Practice
Lakewood Health System, Staples, MN

2023 alumni

Shivani Kapur, MD
Assistant Professor, Multiple Myeloma
University of Pennsylvania Medical Center, Philadelphia, Penn.

Matthew McGee, MD
Clinical Practice
Sanford Health, Bismarck, N.D.  

2022 alumni

Vidya Kollu, MD
Clinical Practice
Genesis Health System, Davenport, Iowa

Reggie Thomes, DO
Gundersen Health System, La Crosse, Wis.

2021 alumni

Mamatha Gaddam, MD
Assistant Professor, Bone Marrow Transplant
University of Arkansas, Little Rock, Ark.

Swapna Narayana Rao Gari, MD
Clinical Practice
South Georgia Medical Center, Valdosta, Ga.

2020 alumni

Amir Bista, MD
Clinical Practice
Aurora BayCare Medical Center, Green Bay, Wis.

Peter Polewski, MD
Clinical Practice
Aurora Medical Center, Grafton, Wis.

2019 alumni

Dipesh Uprety, MD
Assistant Professor, Thoracic Oncology
Karmanos Cancer Institute, Wayne State University Medicine, Detroit, Mich.

Yazhini Vallatharasu, MD
Clinical Practice
ThedaCare Regional Cancer Center, Appleton, Wis.

2018 alumni

Chai Bhaskar, MD
Clinical Practice
Minnesota Health Fairview, University of Minnesota, Minneapolis, Minn.

Deval Rajyaguru, MD
Clinical Practice
Baptist Health Merl M. Mahr Cancer Center, Madisonville, Ky.

2016 alumni

Amritha Karkera, MD
Clinical Practice
Aurora Health Care, Green Bay, Wis.

Pratima Chalasani, MD
Clinical Practice
Carle Foundation Hospital, Urbana, Ill.

2015 alumni

Chad Pedersen, MD
Clinical Practice
Sidney Health Center Cancer Care, Sidney, Mont.

Pawan Karanam, MD
Clinical Practice
Trinity Health of New England, Hartford, Conn.

2014 alumni

Anusha Madadi, MD
Clinical Practice
UnityPoint Health, Waterloo, Iowa

Meghana Raghavendra, MD
Clinical Practice
Franciscan Health, Indianapolis, Ind.

Striking the right balance

Learn more about the Gundersen “family feel” and how a past graduate achieved work-life balance during his time as a fellow in the Hematology & Medical Oncology program.

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.

View housing
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.

Email us

1900 South Ave.
La Crosse, WI 54601

(608) 782-7300

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