Meet Our Experts

A team of recognized experts

The cancer-fighting technology at McLaren Proton Therapy Center is truly innovative, and the team of experts behind it is just as impressive. We’re very proud of our highly accomplished and experienced staff that includes leading radiation oncologists and physicists, as well as other key medical professionals.

These experts are constantly pushing the frontiers of this technology, conducting critical research that will help to further advance this cutting-edge therapy while keeping their primary focus on destroying the cancer and providing patients with the best possible quality of life. This focus on medical expertise is blended with an emphasis on providing emotional, social and spiritual support for patients and their families.

Meet Our Physicians

Hesham Gayar, MD

Hesham Gayar, M.D., a board certified radiation oncologist, is Medical Director for the McLaren Proton Therapy Center. He also serves as Vice President for the Particle Therapy Co-Operative Group (PTCOG) -North American Chapter and as a board member and Steering Committee member for PTCOG worldwide. His involvement in proton therapy also includes membership on the Executive Committee of the Proton Collaborative Group Medical Societies and as a member of the World Forum on Particle Therapy Strategic Planning for 2030. He holds numerous leadership positions at McLaren, including serving as chairman of the Department of Radiation Oncology at McLaren Flint, Associate Medical Director of the Karmanos Cancer Institutes at McLaren Flint, Owosso and Lapeer, Chairman of the Research Advisory Board at McLaren Health Care, and Chairman of the Karmanos Cancer Institute Clinical Leadership Council.

Dr. Gayar earned his medical degree from the Alexandria School of Science in Egypt and completed a residency at St. Vincent’s Hospital in New York and a fellowship at Ohio State University. He also completed training in proton therapy at the Paul Scherrer Institute. He is past president of the Board of Directors of the Genesee County Medical Society, a RTOG Principal Investigator with the Michigan State Medical Society, an American College of Surgeons Liaison Physician and a member of the Scientific Advisory Board for the Cancer Terminator Foundation. Read Dr. Gayar's full physician profile.

 

Kiran Devisetty, MD

Kiran Devisetty, M.D., is a board certified radiation oncologist who joined McLaren in August of 2012. He maintains clinical practices at the McLaren Proton Therapy Center and Karmanos Cancer Institutes in Flint, Owosso, and Lapeer. He is the Medical Director of Karmanos Cancer Network’s Radiation Oncology Research, with responsibility to lead the development and expansion of the radiation oncology clinical trials program. Under his leadership, KCI has consistently been recognized as a top 5 site in accruals within the NRG national trial network.

Dr. Devisetty has had a long standing interest in proton therapy having originally done an externship at Massachusetts General Hospital during residency. He subsequently completed proton therapy courses at the MD Anderson Cancer Center, Mayo Clinic, and Paul Scherrer Institute. He is a strong advocate that proton therapy represents the next stage in the evolution of radiation therapy for cancer treatment, and when used appropriately, can improve treatments by decreasing side effects.

Dr. Devisetty received his medical degree from The University of Michigan School of Medicine followed by his residency at the University of Chicago Hospitals, where he served as Chief Resident. Dr. Devisetty subsequently served as an Assistant Professor in the Medical College of Wisconsin’s Department of Radiation Oncology for three years. While there, he developed and led the liver SBRT program and was also a member of both the lung and head & neck cancer teams. His research work has been published in many prominent cancer journals, including the Journal of Clinical Oncology and Lancet Oncology.

He currently holds the position of Clinical Associate Professor at both Michigan State University and Central Michigan University and the position of Clinical Assistant Professor at Wayne State University. Read Dr. Devisetty's full physician profile.

 

Omar Gayar, MD

Omar Gayar, M.D., is a board certified radiation oncologist. He completed medical school at the University of Missouri in Kansas City. He also completed his transitional year internship and radiation oncology residency at Henry Ford Hospital in Detroit, Michigan, where he served as chief resident. He is now a practicing Radiation Oncologist at the McLaren Proton Therapy Center, and the Karmanos Cancer Institutes in McLaren Flint, Lapeer, and Owosso, Michigan.

Dr. Gayar has served on multiple committees including the Internal Review Board, Lapeer Cancer Committee, and Financial Sub-committee in Lapeer. Read Dr. Gayar's full physician profile.

 

Jack Nettleton, MD

Jack L. Nettleton, M.D., is a board certified radiation oncologist who treats patients at the McLaren Proton Therapy Center in Flint and the Karmanos Cancer Institutes in Flint, Lapeer and Owosso, Michigan. Dr. Nettleton received his medical school education at the University of Washington in Seattle, Washington and completed residencies in Internal Medicine at Michigan State University and Radiation Oncology at the University of Minnesota. Read Dr. Nettleton's full physician profile.