Current Medical Residents

2025 - 2026 Radiation Oncology Residents

 

  • Michael Kessler, MD

    Chief Resident '27

    Hometown: Nashville, TN

    Undergraduate: University of Wisconsin - Madison

    Medical school: University of Tennessee Health Science Center

    Internship: University of Tennessee Nashville Internal Medicine Preliminary

    Research interests: Brachytherapy, Toxicity/Quality of Life, Lung Cancer, Immunotherapy

    Outside interests: Camping, fishing, traveling, intramural sports, fitness/weightlifting, running, golf

  • Gustavo Sosa, MD

    Chief Resident '27

    Hometown: Sacramento, CA

    Undergraduate: University of Southern California

    Medical School: University of Wisconsin School of Medicine and Public Health

    Internship: Internal Medicine, University of Nevada, Las Vegas

    Research interests: Palliative radiotherapy, bone and soft tissue sarcoma, survivorship

    Outside interests: cooking, college football, golf, history, exploring the Nashville food scene

  • Betsy Crosswhite, MD

    Resident '28

    Hometown: Tupelo, MS

    Undergraduate: University of Mississippi

    Medical school: University of Mississippi Medical Center

    Internship: Vanderbilt University Medical Center

               Research interests: clinical trials, treatment toxicity

    Outside interests: cooking, trying new restaurants, ballet, faith

  • David Gannon, MD

    Resident '28

    Hometown: Minneapolis, Minnesota

    Undergraduate: Lafayette College 

    Medical school: Loyola University Chicago 

    Internship: General Surgery, Loyola University Medical Center 

    Research interests: Brachytherapy, SBRT

    Outside interests: Travel, Reading, History, Film

  • Callie Rizzardi, MD

    Resident '28

    Hometown: South Deerfield, Massachusetts

    Undergraduate: University of Massachusetts Amherst

    Medical school: Eastern Virginial Medical School

    Internship: Eastern Virginial Medical School

    Research interests: palliative therapy, quality of life

    Outside interests: hiking, rock climbing, music, traveling, yoga, weightlifting

  • Alemu Kihshen, MD

    Resident '29

    Hometown:  Wukro, Tigray, Ethiopia

    Medical school:  Addis Ababa University School of Medicine, Ethiopia 

    Internship:  Internal Medicine, University of Louisville 

    Research interests: Global oncology care disparities, Brachytherapy,  benign disease

    Outside interests: History,  English Premier League, playing soccer, running 

  • Jacob Menke, MD

    Resident '29

    Hometown: Cincinnati, OH

    Undergraduate: Rhodes College

    Medical School: University of Cincinnati

    Internship: Transitional Year; TriStar Centennial Medical Center, Nashville, TN

    Research Interests: head and neck cancers, prostate cancer, benign diseases

    Outside Interests: playing pickleball, country music, watching sports, working out, trying new restaurants

  • Hemanth Athiraman, MD, PhD

    Resident '30

    Hometown: Vellore, India

    Undergraduate: Vellore Institute of Technology

    Medical school: Saba University School of Medicine

    Internship: SIU Quincy Family Practice

    Research interests: Circulating tumor cells, ultra-low dose radiation

    Outside interests: Hiking, spending time outdoors, and experimenting with breathing techniques

  • Colton Betts, MD

    Resident '30

    Hometown: Santa Ynez, CA

    Undergraduate: University of California, Santa Barbara

    Medical school: Texas A&M University College of Medicine

    Internship: Internal Medicine, UT Southwestern Medical Center

    Research interests: Palliative therapy, clinical trial design

    Outside interests: Volleyball, playing guitar, rock climbing, and cooking

  • John Phillips, MD

    Resident '30

    Hometown:

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