2025 - 2026 Radiation Oncology Residents
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Hayden Byrd, M.D.
Chief Resident '26Hometown: Austin, Texas
Undergraduate: Sewanee- The University of The South
Medical school: University of Texas at Houston
Internship: University of Tennessee Medical Center at Knoxville
Research interests: Radiation for benign diseases such as low dose radiation for osteoarthritis, toxicity outcomes following radiation, novel indications for radiation.
Outside interests: Community; Lacrosse; Outdoors (backpacking, climbing, caving, mountaineering); Violin; Writing
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Jayden Curry Gracie, M.D.
Chief Resident '26Hometown: Memphis, TN
Undergraduate: Vanderbilt University
Medical School: University of Florida
Internship: Vanderbilt University Medical Center, Internal Medicine Prelim
Research Interests: rare disease, treatment toxicity, particle therapy, healthcare system improvement
Outside Interests: dancing (salsa, bachata), painting, home building and interior design, plugging into my faith community, travel, going to the zoo, shopping, horseback riding, being outdoors, eating good food that other people make, writing and inspiring others to live their best lives
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Michael Kessler, MD
Resident '27Hometown: 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
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Gustavo Sosa, MD
Resident '27Hometown: 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
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Betsy Crosswhite, MD
Resident '28Hometown: 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
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Callie Rizzardi, MD
Resident '28Hometown: 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
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David Gannon, MD
Resident '28Hometown: 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
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Alemu Kihshen, MD
Resident '29Hometown: 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
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Jacob Menke, MD
Resident '29Hometown: 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