Meet Our Leaders

Cherif Boutros, M.D.

Cherif Boutros, MD
Medical Director, Tate Cancer Center at University of Maryland Baltimore Washington Medical Center 
Chair, Surgical Oncology at University of Maryland Baltimore Washington Medical Center 
Associate Professor of Surgery, University of Maryland School of Medicine

Cherif Boutros, MD, received his medical degree from Alexandria University in Egypt and completed surgical training at Paris University in France. He completed an internship in general surgery at New York Presbyterian Hospital of Columbia University in New York and a residency in general surgery at Newark Beth Israel Medical Center and Monmouth Medical Center in New Jersey.

Dr. Boutros also completed a surgical oncology fellowship at Roger Williams Medical Center in Providence, Rhode Island and additional training in hepatobiliary and pancreatic surgery at Paul Brousse Hospital in Paris. Dr. Boutros has a special interest in treating gastrointestinal surgical pathologies and hepatobiliary and pancreatic cancers.


Kevin J. Cullen, M.D.

Kevin J. Cullen, MD
Director, University of Maryland Marlene and Stewart Greenebaum Comprehensive Cancer Center
Marlene and Stewart Greenebaum Distinguished Professor in Oncology, University of Maryland School of Medicine

Kevin J. Cullen, MD, specializes in head and neck cancer. A graduate of Dartmouth College and Harvard Medical School, Dr. Cullen completed his internship and residency at Beth Israel Hospital in Boston and received additional training at the National Cancer Institute. He served as interim director of the Lombardi Cancer Center at Georgetown University from October 2000 to September 2002 and was professor of medicine, oncology, and otolaryngology at Georgetown University School of Medicine until joining the University of Maryland in 2004.

Under his leadership, the University of Maryland Greenebaum Comprehensive Cancer Center received NCI Cancer Center designation in 2008, then achieved the comprehensive designation in 2016. Then in The center is ranked in the top 50 cancer centers in the country by U.S. News & World Report's "Best Hospitals" list. Dr. Cullen is a member of the American Cancer Society National Board of Directors, is on the board of directors of the Association of American Cancer Institutes, and was appointed by President Obama as a member of the National Cancer Advisory Board.


Nader N. Hanna, MD

Nader N. Hanna, MD
Director, The Cancer Institute at University of Maryland St. Joseph Medical Center
Professor of Surgery, University of Maryland School of Medicine

Nader N. Hanna, MD, is a nationally-respected surgical oncologist specializing in gastrointestinal oncology, peritoneal surgical malignancies, endocrine tumors and soft tissue sarcomas. He is consistently recognized as a "Top Doc" for surgical oncology by Baltimore Magazine and is included in the "Guide to America's Top Oncologists" published by the Consumers' Research Council of America.

Dr. Hanna joined the faculty in the Department of Surgery at the University of Maryland School of Medicine in August 2004. Prior to coming to Baltimore, he was an associate professor of surgery at the University of Kentucky and served as director of gastrointestinal clinical research at the Lucille Markey Cancer Center. He is board-certified in general surgery and surgical oncology.


Philip Nivatpumin, M.D.

Philip Nivatpumin, MD
Medical Director, Patricia D. and M. Scot Kaufman Cancer Center at University of Maryland Upper Chesapeake Medical Center

Phil Nivatpumin, MD, received his Sc.B. in Biology from Brown University and received his medical degree at the University of California, Los Angeles School of Medicine where he graduated Alpha Omega Alpha. He completed his internship, residency and hematology/oncology fellowship at Johns Hopkins Hospital. He also spent one year there as a chief resident on the Osler Medical Service.

Dr. Nivatpumin enjoys martial arts, yoga and clean eating, and is especially interested in lifestyle modification as a means of psychological, physical and spiritual healing. He is board certified in internal medicine, hematology and oncology. Dr. Nitvatpumin serves as the lead physician assisting in the continued growth of the Kaufman Cancer Center and in the affiliation with the University of Maryland Marlene and Stewart Greenebaum Comprehensive Cancer Center.

John A. Olson, Jr., MD, PhD
Director, University of Maryland Cancer Network
Associate Director, University of Maryland Marlene and Stewart Greenebaum Comprehensive Cancer Center
Chief, Division of General and Oncologic Surgery, University of Maryland Medical Center
Campbell & Jeanette Plugge Professor and Vice Chair of Surgery, University of Maryland School of Medicine

John A. Olson, Jr., MD, PhD, specializes in endocrine and oncologic surgery with an emphasis on endocrine malignancies and breast. His clinical research interests include development of biomarkers for breast cancer and the study of aromatase inhibitor therapy to improve surgical outcomes for post-menopausal women with breast cancer.

Previously serving as Chief of Endocrine, Breast, and Oncologic Surgery at Duke University Medical Center, he received his medical degree and doctorate in Pharmacology and Experimental Therapeutics from the University of Florida. He received his general surgery training at Washington University in St. Louis and completed a surgical oncology fellowship at Memorial Sloan-Kettering Cancer Center in New York.