Provider photo for Leon Hwang

Education and Credentials

Medical Education:
Southwestern Medical School, Dallas, TX
Johns Hopkins Bayview Medical Center, Baltimore, MD
Johns Hopkins Bayview Medical Center, Baltimore, MD
Johns Hopkins Hospital, Baltimore, MD
Board Certification:
Medical Oncology, American Board of Internal Medicine

Resources for My Patients

Diseases and Conditions


Office Visit

Offices and Directions


Oncology ONC1
Office Address: 
655 Watkins Mill Road
Gaithersburg, MD 20879
Phone Numbers: 


Welcome to my Web page. You’ve taken a positive step in improving our communication, which is so vital to your health care. First, you should know that you’ll be treated by top hematology/oncology physicians, as well as the most caring nurses and staff. You’ll be offered a wide range of options for possible treatment, including chemotherapy (intravenous or oral), biologic therapy, targeted therapy, and opportunities to participate in research trials. All of your specialists, from your surgeon to your oncologist to your pharmacist will have access to your labs, records, radiology films, and care plans. We’ll supplement your care with the power of the internet, so you can email your physician and fill prescriptions from home. Please see the links on this page to contact me and for additional resources.

My advice to patients:

Call us with any concerns. Cancer care can be complicated; we can give you answers and reassurance.

Please bring a family member or a good friend to your first visit and to other important meetings with your physician. Having the support of a person you trust can be vital to making our meetings fruitful.

My goal is to give you the longest and best quality of life possible. Please communicate your goals and priorities to me so that I can help you fulfill your goals.

Stay positive. The therapies are so much easier and more effective than they used to be.

Awards & Recognition

  • Top Doctor, Washingtonian Magazine, 2010, 2012, 2014, 2015, 2016, 2017
  • Super Doctor, Washington Post, 2012, 2013
  • Top Doctor, Washington Consumers' Checkbook, 2011, 2017
  • American Cancer Society Health Care Hero Award, 2010
  • Daily Record Physician Finalist Health Care Heroes, 2010
  • America’s Best Doctors – Consumer Research Council, 2005-present
  • Cancer Research Institute Postdoctoral Fellowship Research Award, 1996-1998
  • Cum Laude, Yale University, 1987

About Me: Outside the Office

Roles and Responsibilities

My Colleagues

My Staff

What My Patients Say

Dr. Hwang was terrific: encouraging, positive, and caring. He's the best. Also, the nurses in the oncology ward at Gaithersburg are exceptional. They treat you like you're family. What incredibly fine people! - JR

I received exceptional, all-encompassing care with Dr. Hwang as the lead. Dr. Hwang restored my health and prolonged my life with his knowledge, honesty, encouragement, and compassion. Communicating with him is easy. He’s so thoughtful that when I emailed him on important matters regarding treatment, he takes time to telephone me, usually the same day, to discuss whatever I’m going through. Dr. Hwang consistently gives thorough options, as well as the research behind the options. - MB

I have been seeing Dr. Hwang and his staff for years now and overall received excellent care and concern from both Dr. Hwang and his staff. I appreciate greatly Dr. Hwang's willingness to coordinate my care with my oncologists at NIH from whom I have also been receiving care and treatment since 2000. I admire Dr. Hwang's commitment to supporting drug trials and other treatment trials in an effort to provide the best and most appropriate care for his patients. - SR

I had a very pleasant experience with Dr. Hwang from day one when we met him for consultation. He was straightforward and very knowledgeable on the discussions we had with him. When I went back for my visit after the surgery, he was very patient and explained about the medications I needed to take and the required follow-up with him. He made both my husband and I feel comfortable and we felt confident on follow-up treatment with his guidance. Thank you Dr. Hwang; I look forward to seeing you for my future appointments. - GS

Dr. Hwang is my cancer doctor. He has been very responsible and very helpful in fighting my cancer. Thank you very much Dr. Hwang for your excellent work and care for me! - DF

My husband …. turned to Dr. Hwang for close contact, professional guidance and personal compassion. - WD