Guy Tillinghast, MD

Dr. Tillinghast is a 1992 graduate of Brown University School of Medicine in Providence, RI. He completed his Internal Medicine Residency at the University of Massachusetts in 1995 and a Medical Oncology Fellowship at the National Cancer Institute (NCI), National Institutes of Health, in Bethesda, MD in 1998. Dr. Tillinghast was a Research Associate at the NCI where he completed an additional 3 years of cancer research, and was the Medical Director of the Clinical Research Program at PCI. He has broad experience in all types of solid tumors, particularly breast cancer, lung cancer and gynecologic tumors. Dr. Tillinghast is Board Certified in Internal Medicine and board eligible in Medical Oncology.


Internal Medicine
Medical Oncology
Radiation Oncology


Breast Cancer
Lung Cancer
Gynecological Cancers

Board Certifications

Medical Oncology – American Board of Internal Medicine
Internal Medicine – American Board of Internal Medicine


Medical Oncology Fellowship
National Cancer Institute (NCI), National Institutes of Health, Bethesda, MD (1998(

Internal Medicine Residency
University of Massachusetts (1995)

Medical Education
Brown University School of Medicine, Providence, RI (1992)


Fundraising efforts throughout the year help LH/UH Seidman Cancer Center continue to carry out our mission to provide world-class cancer care and oncology services to residents within driving distance of Mentor and Lake County.