Our Faculty

Martin Colman, MD, FRCR, FACR, FACRO

Professor and Chairman
John Sealy Distinguished Centennial Chair
Department of Radiation Oncology

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Dr. Colman came to UTMB to chair the Department of Radiation Oncology in 1996. Before coming to Galveston, Dr. Colman was with the University of California, Irvine where he received the title of Emeritus Professor. He is a member of the Royal Colleges of Physicians & Surgeons and a graduate of the University of Witwatersrand, Johannesburg. Dr. Colman has extensive training in both radiation oncology and nuclear medicine, and his area of expertise is in prostate cancer. He is board certified by the American Board of Radiology and is a fellow of the American College of Radiation Oncology and the American College of Radiology.

Sandra "Sunny" Hatch, MD, FAACS, FACCS, FACR

Professor and Vice-Chairman
Director of Clinical Operations
Residency Program Director
Irma  Labardini Mendoza & Jesse Jesus Mendoza Chair
Ruth Levy Kempner Professor
Department of Radiation Oncology
Clinical Division

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Dr. Hatch has been a faculty physician with UTMB for over fifteen years, specializing in breast and gynecological cancers. She is board certified in Radiation Oncology by the American Board of Radiology (ABR) and is a fellow of the American College of Radiology. She is also an active member with the American Society for Therapeutic Radiology & Oncology (ASTRO). She received her doctorate in medicine from the University of Texas Health Science Center at Houston, TX and completed her residency in radiation therapy at Baylor College of Medicine as chief resident. Before entering medical school, Dr. Hatch received her degree in engineering from Tennessee Technological University, which served as a solid foundation for the technological demands found in the field of radiotherapy.

Ivan L. Kessel, MD

Associate Professor
Department of Radiation Oncology
Clinical Division
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Dr. Kessel has been on the faculty of UTMB since 2001. He is a medical graduate of the University of the Witwatersrand in Johannesburg, South Africa and board certified in Radiation Oncology by the American Board of Radiology (ABR). He did his residency training at the Johannesburg Hospital and at the Princess Margaret Hospital in Toronto, Canada. Dr. Kessel served 6 years on the faculty of the University of Witwatersrand/Johannesburg Hospital, and 10 years in private practice before joining the faculty of UTMB. He directs the Thoracic, GI, and Head & Neck Cancer services in the department of Radiation Oncology. He is the principal investigator for the Radiation Therapy Oncology Group (RTOG) at UTMB.

Melissa Joyner, MD, MBA

Assistant Professor
Clinical Division
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Melissa Joyner, MD is a Radiation Oncologist specializing in the treatment of Gynecologic, Genitourinary, and Breast cancers. She is an assistant professor of Radiation Oncology at the University of Texas Medical Branch. Dr. Joyner completed her radiation oncology training at the University of Texas Health Science Center in San Antonio (UTHSCSA), Texas where she also served as Chief Resident. She also received her Doctorate of Medicine at UTHSCSA and is board certified in Radiation Oncology by the American Board of Radiology (ABR). Dr. Joyner has a Master of Business Administration degree and a Bachelor of Business Administration degree with an extensive business background prior to attending medical school. Dr. Joyner will be participating in Radiation Therapy Oncology Group (RTOG) studies in conjunction with University of Texas Medical Branch’s Department of Gynecology. She has presented at national and international conferences including the ASTRO’s Translation Research Conference, SBRT in Copenhagen, ESTRO, and RSNA.

Todd Swanson, MD, PhD

Assistant Professor
Clinical Division
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Dr. Swanson has significant experience with Image Guided Radiation Therapy as well as High Dose Rate Brachytherapy. He specializes in the treatment of cancers of the lung, gastrointestinal tract, prostate, female reproductive tract and breast. He also works to coordinate clinical trials, as a member of the Radiation Therapy Oncology Group (RTOG). His work has been recognized with several awards from the American Society of Clinical Oncology and the American Brachytherapy Society. He attended the University of California- Davis, as an undergraduate majoring in Genetics and Political Science. After working in the laboratory focusing on molecular oncology at Genentech, he went on to pursue medical training at The Chicago Medical School. There, he completed both a Medical Degree (MD) and Doctor of Philosophy (PhD) in Microbiology and Immunology. He received his residency training at The William Beaumont Hospital in Royal Oak, MI where he served as chief resident. Dr Swanson is board certified in Radiation Oncology by the American Board of Radiology (ABR). While at UTMB, he strives to integrate cutting edge treatments with compassionate care in the comfort and cure of cancer patients.

Lee Wiederhold, MD, PhD

Assistant Professor
Clinical Division

Dr. Wiederhold’s subspecialty focus is head and neck cancer. He collaborates closely with Dr. Vicente Resto and Dr. Susan McCammon in the Department of Otolaryngology/Head and Neck Surgery. Dr. Wiederhold graduated from the UTMB Medical Scientist Training Program with his MD and PhD degrees in 2005. He served his transitional year at the University of Texas Health Science Center at Houston from 2005 to 2006, and completed his residency in Radiation Oncology at UTMB in 2010. He was Chief Resident for his final year, 2009 to 2010.  Dr. Wiederhold is also board certified in Radiation Oncology by the American Board of Radiology (ABR).