John Marshall is a Hematologist Oncology specialist and a Hematologist in Washington, Washington, D.c.. Dr. Marshall is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Familial Colorectal Cancer, Colorectal Cancer, Lynch Syndrome, Hepatectomy, and Pancreatectomy.

Dennis Priebat is a Hematologist Oncology specialist and an Oncologist in Washington, Washington, D.c.. Dr. Priebat is rated as a Distinguished provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Adult Soft Tissue Sarcoma, Undifferentiated Pleomorphic Sarcoma, Mesenchymoma, and Rhabdomyosarcoma Embryonal.

Bruce R. Kressel, M.D., is a medical oncologist at Johns Hopkins Kimmel Cancer Center at Sibley Memorial Hospital and an instructor at Johns Hopkins University School of Medicine. In addition to an expertise in breast and lung cancer, Dr. Kressel has an expertise in gynecologic oncology and general medical oncology, with specific focuses on hematologic malignancies including lymphoma, leukemia and myeloma. Dr. Kressel earned his medical degree at Tufts University School of Medicine. He completed a residency in internal medicine at George Washington University School of Medicine, followed by a fellowship in hematology and oncology, also at George Washington University School of Medicine. Dr. Kressel completed a fellowship in oncology at the Georgetown Lombardi Comprehensive Cancer Center as well. Dr. Kressel has been regularly named one of America’s Top Doctors and one of America's Top Doctors for Cancer by Castle Connolly. He has also been named a Top Doctor in the Washington D.C. and Washington-Baltimore areas by Castle Connolly, as well as a Top Doctor by Consumers’ Checkbook Magazine and Washingtonian Magazine. Dr. Kressel is a member of the American Society of Clinical Oncology and the American Society of Hematology. Dr. Kressel has contributed to numerous publications, presentations and clinical trials. Dr. Kressel is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Essential Thrombocythemia, Non-Hodgkin Lymphoma, Gastric Lymphoma, Chronic Lymphocytic Leukemia (CLL), and Splenectomy.

Dr. Michail Mavros, a surgical oncologist specializing in complex cancers, is deeply committed to offering his patients personalized, advanced care. Originally from Athens, Greece, Dr. Mavros's passion for oncology was sparked during medical school after losing a close friend to cancer. This life-changing event inspired him to dedicate his career to improving the lives of cancer patients. Dr. Mavros is one of few surgeons with accredited subspecialty training in both complex surgical oncology and hepato-pancreato-biliary (HPB) surgery, making him highly qualified to treat cancers of the liver, pancreas, and bile ducts. He is also skilled in minimally invasive techniques, including laparoscopic and robotic-assisted surgery, which offer benefits such as faster recovery, reduced pain, and improved outcomes. At the heart of Dr. Mavros' approach is his belief in individualized care. He works closely with a multidisciplinary team of experts, including medical oncologists, radiation oncologists, and pathologists, to ensure each patient receives a thorough evaluation. This collaborative approach results in comprehensive, personalized treatment plans. By leveraging the latest advances in precision medicine, Dr. Mavros tailors his treatments to meet the unique needs of each patient, guided by the most current scientific research and evidence-based practices. Dr. Mavros is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Familial Pancreatic Cancer, Neuroendocrine Tumor, Pancreatic Cancer, Pancreaticoduodenectomy, and Pancreatectomy.

Dr. Brett Parker is a general surgeon and fellowship-trained minimally invasive foregut and bariatric surgeon. He is an Assistant Professor of Surgery at Johns Hopkins and also the Program Director for the Johns Hopkins Advanced GI and Minimally Invasive Surgery Fellowship Program. Dr. Parker is an expert in minimally invasive surgical techniques including advanced laparoscopy and robotic surgery, as well as therapeutic flexible endoscopy. He is interested in promoting the evolving indications for surgical repair of hiatal hernias, as well as adjunct procedures surgeons can use to reduce recurrence rates. He offers a wide range of interventions for GERD, including innovative endoscopic therapies, and promotes early surgical referral to discuss and tailor therapy to individual patient circumstances. Dr. Parker also has a robust abdominal wall reconstruction and weight loss surgery practice. He is widely published on the surgical outcomes of foregut surgery, emerging technologies, and innovation, as well as surgical simulation and skills transfer. Dr. Parker has consistently been selected as a Washingtonian Magazine Top Doctor in 2023, 2024, and 2025. As a member of the Johns Hopkins Division of Minimally Invasive Surgery in the Greater Washington Area, Dr. Parker is dedicated to the best, individualized, patient outcomes. Learn more about Dr. Parker and his partners within the Johns Hopkins Division of Minimally Invasive Surgery, the Johns Hopkins Heartburn Center and the Johns Hopkins Motility and Neurogastroenterology Center. Dr. Parker is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Hiatal Hernia, Hernia, Congenital Diaphragmatic Hernia, Endoscopy, and Gallbladder Removal.

Karim Boudadi, M.D., is a medical oncologist and hematologist with the Johns Hopkins Kimmel Cancer Center at Sibley Memorial Hospital in Washington, D.C., and an assistant professor in the Department of Oncology at Johns Hopkins University School of Medicine. Listen to Dr. Boudadi’s Cancer Matters podcast episode to learn more about his work. Dr. Boudadi has expertise in treating cancers of the head and neck, including salivary gland cancers, as well as cancers of the esophagus, and bone and soft tissue sarcomas. Having completed dual training in medical oncology and hematology at Johns Hopkins University, Dr. Boudadi also treats patients with benign hematologic conditions or non-cancer related blood disorders, such as anemia, low blood counts, bleeding disorders, and clotting disorders. Dr. Boudadi earned his medical degree from the University of Rochester School of Medicine. He completed a residency in internal medicine at the University of Michigan in Ann Arbor, MI, and went on to serve as a clinical lecturer in the Department of Internal Medicine at the University of Michigan Medical School before joining Johns Hopkins. He then completed dual fellowship training in both hematology and medical oncology at the Johns Hopkins University School of Medicine. Dr. Boudadi's research during his fellowship focused on prostate cancer and immunotherapy. Dr. Boudadi is a member of the American Society of Clinical Oncology, the American Society of Hematology, the American College of Physicians, and the American Medical Association. He is also a member of the Hematology and Oncology Fellowship Selection Committee at The Johns Hopkins University School of Medicine. Dr. Boudadi has extensive clinical trial development experience and has published his work in peer-reviewed journals. His primary research interest is immunotherapy. Recent News Articles and Media Coverage Cancer Matters Podcast: Dr. Bill Nelson discussing the treatment of HPV related head and neck cancers, Johns Hopkins Kimmel Cancer Center Podcasts (May 23, 2019). Dr. Boudadi is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Glioma, Mesenchymoma, Undifferentiated Pleomorphic Sarcoma, Gastrointestinal Stromal Tumor, and Prostatectomy.

Marcus Noel is an Oncologist and a Hospital Medicine provider in Washington, Washington, D.c.. Dr. Noel has been practicing medicine for over 18 years and is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Pancreatic Cancer, Familial Pancreatic Cancer, Cholangiocarcinoma (Bile Duct Cancer), Neuroendocrine Tumor, and Tissue Biopsy.

Benjamin Weinberg is a Hematologist Oncology specialist and a Hematologist in Washington, Washington, D.c.. Dr. Weinberg is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Colorectal Cancer, Pancreatic Cancer, Familial Colorectal Cancer, Vertebroplasty, and Colonoscopy. Dr. Weinberg is currently accepting new patients.

Nadim Haddad is a Gastroenterologist in Washington, Washington, D.c.. Dr. Haddad is rated as an Advanced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Gallstones, Gallbladder Disease, Bile Duct Obstruction, Gallbladder Removal, and Endoscopy. Dr. Haddad is currently accepting new patients.

Quyen Chu is a Surgical Oncologist and a General Surgeon in Washington, Washington, D.c.. Dr. Chu is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Breast Cancer, Pancreatic Cancer, Colorectal Cancer, Mastectomy, and Pancreatectomy. Dr. Chu is currently accepting new patients.

Valerie Lee, M.D., is a medical oncologist with the Johns Hopkins Sidney Kimmel Cancer Center at Sibley Memorial Hospital, as well as an instructor of medical oncology at Johns Hopkins University School of Medicine. Dr. Lee has an expertise in management of gastrointestinal malignancies, including gastric, colon and pancreatobiliary cancers. Dr. Lee earned her medical degree from the Columbia University College of Physicians and Surgeons. She completed a residency in internal medicine at New York Presbyterian Hospital, followed by a fellowship in medical oncology at the Johns Hopkins University School of Medicine. Dr. Lee is currently earning her Certificate in Science of Clinical Investigation at Johns Hopkins Bloomberg School of Public Health. Dr. Lee is a member of the American Society of Clinical Oncology. Dr. Lee manages multiple early phase trials and her work has been published in peer-reviewed journals. Her research interests include clinical trials for patients with gastrointestinal malignancies, and combining traditional chemotherapies with immunotherapy to improve survival and quality of life for patients. She has received a Cancer Center Training grant for research on molecular targets for cancer detection and treatment and has spoken at numerous conferences on updates in gastrointestinal malignancies. Dr. Lee is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. Her top areas of expertise are Pancreatic Cancer, Familial Pancreatic Cancer, Familial Colorectal Cancer, Colorectal Cancer, and Pancreaticoduodenectomy.

Dr. Michael Pishvaian is the director of Gastrointestinal, Developmental Therapeutics and Clinical Research Programs for the Johns Hopkins Kimmel Cancer Center in the Greater Washington Area and an associate professor at the School of Medicine. Dr. Pishvaian is a fellowship-trained gastrointestinal oncologist specializing in pancreatic and refractory colorectal cancers. He is committed to precision medicine and provides his patients with the most appropriate and advanced level of care. He conducts all phases of clinical trials for all GI cancers and enrolls qualifying patients. Click here to learn more about oncology clinical trials the Greater Washington Area. Dr. Pishvaian is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Pancreatic Cancer, Colorectal Cancer, Familial Pancreatic Cancer, Pancreaticoduodenectomy, and Pancreatectomy.

Walid Chalhoub is a Gastroenterologist in Washington, Washington, D.c.. Dr. Chalhoub is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Jaundice, Bile Duct Obstruction, Bile Duct Cysts, Endoscopy, and Gastrostomy.

Patrick Jackson is a General Surgeon and a Surgical Oncologist in Washington, Washington, D.c.. Dr. Jackson is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Hernia, Hiatal Hernia, Congenital Diaphragmatic Hernia, Pancreatectomy, and Vagotomy. Dr. Jackson is currently accepting new patients.

Chukwuemeka Ihemelandu is a Surgical Oncologist and a General Surgeon in Washington, Washington, D.c.. Dr. Ihemelandu is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Appendix Cancer, Colorectal Cancer, Familial Colorectal Cancer, Bladder Reconstruction, and Colostomy. Dr. Ihemelandu is currently accepting new patients.

Martin Paul is a General Surgeon in Washington, Washington, D.c.. Dr. Paul is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Hernia, Femoral Hernia, Cholecystitis, Hernia Surgery, and Ureteral Reconstruction.

Paul Lin is a General Surgeon in Washington, Washington, D.c.. Dr. Lin is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Pancreatic Cancer, Hernia, Gallbladder Disease, Pancreatectomy, and Gastrectomy.

Timothy Kennedy is a Surgical Oncologist and a General Surgeon in Washington, Washington, D.c.. Dr. Kennedy is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Stomach Cancer, Colorectal Cancer, Familial Colorectal Cancer, Pancreatectomy, and Small Bowel Resection. Dr. Kennedy is currently accepting new patients.

Khashayar Vaziri is a General Surgeon in Washington, Washington, D.c.. Dr. Vaziri is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Hernia, Gallbladder Disease, Umbilical Hernia, Endoscopy, and Gastrectomy.

Stanley Pietrak is a Gastroenterologist in Washington, Washington, D.c.. Dr. Pietrak is rated as an Experienced provider by MediFind in the treatment of Gastrointestinal Stromal Tumor. His top areas of expertise are Bile Duct Stricture, Bile Duct Obstruction, Cholestasis, Gastrectomy, and Endoscopy.