Cancer Care Physicians
Practice Name- Central Ohio Radiation Oncology
Mark Becker, M.D. is a Board Certified Radiation Oncologist who serves as Medical Director of the Radiation Oncology Services. He has worked at Fairfield Medical Center for the last 10 years. Prior to coming to Lancaster he was an Attending Physician at The Cleveland Clinic Foundation in Cleveland Ohio. Training was completed in California where he served as a fellow at Stanford University Medical Center. Medical Education was at Drexel University in Philadelphia Pennsylvania.
Practice Name- General Surgical Associates
Jeffrey K. Yenchar, MD
Completed residency at The Ohio State University and has been practicing in Lancaster for the last twelve years. He is a proud sponsor and participant in Relay 4 Life.
David J. Robertson, MD
Completed residency at The Ohio State University and has been practicing in Lancaster since 2005. Proud sponsor and participant in Relay 4 Life.
Margaret S. Sawyer, MD
Complete residency at The Ohio State University and has been practicing in Lancaster for the last two years. Proud sponsor and participant in Relay 4 Life.
All three surgeons of General Surgical Associates completed their residency at The Ohio State University and proudly serve the Lancaster community and surrounding counties. All are an active participant and sponsor of Relay 4 Life.
Chuck Cho, MD - is a board certified radiation oncologist. Prior to founding Delaware Radiation Oncology in 1999, Dr. Cho worked in the central Ohio area, specifically Grant Medical Center, since 1985. He was an attending physician at University Hospital, Ann Arbor, Michigan from 1982 – 1985. His medical education includes a fellowship and residency at The Ohio State University Hospitals in radiation oncology and medical degree from Seoul National University, College of Medicine, Seoul, Korea.
Practice Name- Lancaster Radiation Oncology
Hong Zhang, MD - is a board certified Radiation Oncologist. She earned her medical degree from Nanjing Medical University, China. She completed her Radiation Oncology residencies and fellowship training at the Ohio State University/Arthur G. James Cancer Hospital. She was an attending physician at University Radiation Medicine in Cleveland. She worked at Lima Memorial Cancer Institute prior to joining Central Ohio Radiation Oncology and Newark Radiation Oncology.
Practice Name- Central Ohio General Surgeons
Scott O. Johnson, M.D., F.A.C.S Graduated from the University of Virginia where he received his Bachelor of Arts degree in Biology, Dr. Johnson received his Medical Degree from The Ohio State University College of Medicine. After Medical School, Dr. Johnson completed his General Surgery training and chief residency at Mount Carmel Health Systems. Dr. Johnson is Board Certified in General Surgery and is a Fellow of the American College of Surgery. He has a special interest in the cancer surgery of the breast and colon and surgical endoscopy. Dr. Johnson has been serving the Lancaster area for over eleven years.
David M. Hasl, M.D., F.A.C.S joined Central Ohio General Surgeons on September 1, 2003. Dr. Hasl and his family moved to the Lancaster area from Cincinnati where he was in practice for five years. Dr. Hasl completed Medical School at Wright State University School of Medicine in 1992 and finished his surgical residency at Riverside Hospital in Columbus in 1998. Dr. Hasl is Board Certified in General Surgery and is a Fellow of the American College of Surgery. Dr. Hasl has a special interest in hernia repairs, gastrointestinal surgery, surgical diseases of the breast, surgical endoscopy and advanced laproscopy, including laproscopic ventral hernia repairs, and colorectal cancer screening and prevention.
Timothy J. Custer, M.D., F.A.C.S was born and raised in Columbus, Ohio. He graduated Summa Cum Laude with a degree in biology from Grace College in Warsaw, Indiana, and he received his Medical Degree from The Ohio State University in 1996. Dr. Custer completed his surgical residency at Mount Carmel Medical Center in 2001. He is Board Certified in General Surgery and is a Fellow of the American College of Surgery. Dr. Custer was in private practice for three years before joining Central Ohio General Surgeons in July 2004. Special interests include gastrointestinal Bariatric and advanced laparoscopic surgery.
Elwood R. Martin, M.D., F.A.C.S. received his medical degree from the Ohio State University College of Medicine. He then completed his internship and residency at Riverside Methodist Hospital.
Practice Name- Central Ohio Plastic Surgery, Inc
Jason B. Lichten, MD, FACS is certified by the American Board of Plastic Surgery. He is an active member of the American Society of Plastic Surgeons and a Fellow of the American College of Surgeons. Before becoming a plastic surgeon in Columbus, Ohio, Dr. Lichten earned his Medical Degree from Jefferson Medical College in Philadelphia, Pennsylvania in 1998 and then completed a full 5-year General Surgery Residency at Beth Israel Medical Center in New York City. While there, Dr. Lichten received numerous awards including the Leon Ginzburg Achievement Award for Outstanding Chief Resident.
Practice Name- Lancaster Cardiothoracic Surgeons
Aryeh Cohen, MD - came to FMC in 2007, from Loyola University Medical Center in Chicago, where he completed his training in Cardiovascular and Thoracic surgery. He completed his general surgical training at Morristown Memorial Hospital, an affiliate of UMDNJ in New Jersey. There he was awarded the Ames L. Filippone Jr., MD chairman’s award for his compassionate care. In 2000 Dr. Cohen graduated from Sacker School of Medicine. He attended Yeshiva University in New York City graduating in 1990. He also participated in research at the Mount Sinai School of Medicine and has authored articles in several major medical journals.
Practice Name- Fairfield Pulmonary and Crtical Care Associates
Andrew Twehues, MD- was raised in a small rural town in Northern Kentucky. Undergraduate and medical school was attended at the University of Kentucky. He completed his residency in Internal Medicine at OSU and stayed for fellowship in Pulmonary/Critical Care. His interests include COPD and early recognition and treatment of sepsis. He resides in Lancaster with his fiancé Morgan Schrock, who is a veterinarian, and his dog, Betty.