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IOS Board of Directors


Mark A. Henderson, MD
Radiation Oncologist
The Cancer Center of Columbus Regional Health

Mark A. Henderson, MD, trained at Indiana University School of Medicine in radiation oncology and taught there for six years. He later moved to Oregon where he worked for a private practice and taught at Oregon Health and Science University. In 2018, Dr. Henderson returned to Indiana to be closer to family and to work for the Columbus Regional Health Cancer Center.

Dr. Henderson is skilled in gamma knife and linear accelerator-based radiosurgery, stereotactic body radiotherapy, intensity-modulated radiotherapy, image-guided radiotherapy, 3D-conformal radiotherapy, partial breast brachytherapy and unsealed source radiotherapy. He is board certified in radiation oncology by the American Board of Radiology.


Hamid Sayar, MD
Associate Professor of Clinical Medicine
Indiana University Medical Center


Mary Miller, MSN RN-BC OCN
Nurse Manager
St. Francis Medical Group

Immediate Past President

Ahad Sadiq, MD
Medical Oncologist/Hematologist
Fort Wayne Medical Oncology and Hematology

Ahad Sadiq, MD, is board certified in internal medicine, hematology, and oncology, and has a special interest in thoracic oncology. He leads several clinical trials in thoracic oncology at Fort Wayne Medical Oncology and Hematology—focusing on the benefit of using immunotherapies.


Maqbool Ahmed, MD
Medical Oncologist
Deaconess Gateway Hospital
Gina Borden, RN, BSN
Director of Oncology
Baptist Health Floyd Cancer Center of Indiana
John R. Edwards, MD
Co-Medical Director
Indiana Blood and Marrow Transplantation
Indianapolis, IN

John Edwards, MD, is the Co-Medical Director of Indiana Blood and Marrow Transplantation (IBMT), specializing in hematologic malignancies and stem cell transplantation. He is the past president of the Indiana Oncology Society. Prior to joining IBMT, Dr. Edwards was the founding director of the Florida Center for Cellular Therapy at Florida Hospital, the first BMT program in Central Florida. He has previously worked in industry as the President/COO/CMO of Lifeforce Cryobanks and as Medical Director at CTI Clinical Trial and Consulting. Dr. Edwards attended medical school at the University of Florida and then trained in pediatrics and immunology and hematology/oncology at the University of California, San Francisco. He also served on the faulty at Vanderbilt University.

Kelsey Finch, PharmD, BCOP
Oncology Pharmacist Practitioner
Columbus Regional Health
Evelyn Hunter, LCSW, OSW-C
Social Worker
Baptist Health Cancer Center

1801 Research Boulevard Suite 400
Rockville, MD 20850
Tel: 301.984.9496 | Fax: 301.770.1949
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