Advocate Radiation Oncology

Dr. Thomas Klein


  • Bachelor’s Degree – Duke University
  • Ph.D. – Mount Sinai School of Medicine – Molecular Genetics
  • Medical Degree – Mount Sinai School of Medicine
  • Residency – Yale School of Medicine – Radiation Oncology

Board Certifications

  • Radiation Oncology

Thomas J. Klein, M.D., Ph.D., FACRO

Thomas J. Klein, M.D., Ph.D., FACRO is a board-certified radiation oncologist who provides world class cancer treatment in a caring community setting. He values the personal relationships he forms with each of his patients and is committed to helping them in their fight against cancer. Dr. Klein is an advocate for his patients both in and out of the clinic. He has raised awareness on news broadcasts, lobbied for cancer patients’ rights on Capitol Hill, and educated physicians around the country on making better treatment decisions for their patients.

Dr. Klein graduated with honors from Duke University and went on to earn both an M.D. and a Ph.D. in Molecular Genetics from Mount Sinai School of Medicine in New York City. After an internship year at Georgetown University Medical Center, Dr. Klein completed his radiation oncology training at the Yale School of Medicine where he was named Chief Resident and Yale’s first ever Leonard B. Holman Research Pathway Resident. Dr. Klein has been honored with numerous grants and awards, including induction into the prestigious Alpha Omega Alpha Honor Medical Society. He has been recognized as a “Top Doctor” by multiple publications.

Dr. Klein is an expert in the treatment of a wide variety of cancer types, including breast, prostate, lung, and skin cancers. He has published peer-reviewed research in a number of top academic journals and has presented at both national and international meetings. Dr. Klein is a member of the American College of Radiation Oncology (ACRO), the American Society of Radiation Oncology (ASTRO), the American Society of Clinical Oncology (ASCO), and the American Radium Society (ARS).  He served as the Oncology Preceptor for the University of Miami’s Hospice and Palliative Medicine Fellowship Program and taught in courses at the Yale University School of Medicine, Florida Atlantic University, and at the Mount Sinai School of Medicine.

Outside of the clinic, Dr. Klein loves spending time with his three children, Ethan, Jared, and Rachel, as well as his dog Calvin. He enjoys cooking for friends, travelling the world, and cheering for Duke Basketball.