Shawn M. Howell, MD, FACC

“I make each patient feel as though he or she is my only patient. I explain my patient’s medical conditions and answer all questions in a way they can understand. Effective communication ensures my patient’s success with their treatment plan.”
































Shawn M. Howell, MD, FACC, FSCAI

Board Certified: Cardiovascular Diseases, Nuclear Cardiology, Interventional Cardiology, Cardiovascular Computed Tomography

Dr. Shawn M. Howell is a board-certified cardiologist with a particular interest in women’s health.  She is also board-certified in interventional cardiology, nuclear cardiology and cardiovascular computed tomography.  A native of Baltimore, Maryland, Dr. Howell earned a bachelor of science from Loyola University Maryland (magna cum laude) and her medical degree from the University of Maryland School of Medicine. She then completed a residency in internal medicine at Hahnemann University in Philadelphia, PA, where she served as a chief resident.

While pursuing fellowship training in cardiology and interventional cardiology at The George Washington University Hospital, Dr. Howell served as chief fellow of cardiology. She is currently an attending physician at The George Washington Hospital.  She also has privileges at Medstar Washington Hospital Center, Suburban Hospital in Bethesda, Maryland and Sinai Hospital of Baltimore, Maryland.

When it comes to her patients, Dr. Howell chooses an educational approach. She wants her patients to fully understand their disease before they leave her office. She is active in community outreach programs and educates people about the prevention and treatment of cardiovascular disease. Dr. Howell has been treating patients in the DC metro area since 2005. Dr. Howell is married. Her husband, Roderick Holloman is an attorney and founder of The Holloman Law Group. They have one child, Mufasa, a feisty, spoiled-rotten 15 year old Australian Silky Terrier.  Mufasa has been with them since he was 3 months old and he is her heart!  Dr. Howell is an avid cyclist who loves warm weather and traveling to the Caribbean.  The artistic side of Dr. Howell loves interior design and she has completed several projects that she is particularly proud of!  She also enjoys wine, specifically, South African and New Zealand wines. Becoming a sommelier is on her "to do" list".

Words I live By

  • “Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful”. –Albert Shweitzer, philosopher (1875-1965)
  • “Do not follow where the path may lead. Go, instead, where there is no path and leave a trail”. -Ralph Waldo Emerson, poet (1803-1882)
  • “When you focus on being a blessing, God makes sure that you are always blessed in abundance”. –Joel Osteen, pastor
  • “When you learn, teach; when you get, give.” -Maya Angelou, poet (1928-2014)
  • “I can do all things through Christ who strengthens me.” Philippians 4:12-13
  • “My purpose in life is not fame or fortune, rather using my God given gifts to heal the sick and make a difference in the lives of my patients.” –Shawn M. Howell, physician


  • Fellowship: Cardiology and Interventional Cardiology, The George Washington University Hospital, Washington, DC
  • Residency: Internal Medicine, Hahnemann University, Philadelphia, PA
  • Medical Degree: University of Maryland School of Medicine, Baltimore, MD
  • Bachelor of Science: Loyola College, Baltimore, MD

Specialties / Interests

  • Adult cardiovascular medicine
  • Cardiac catheterization
  • Percutaneous coronary intervention
  • Pregnancy-related heart disease
  • Pulmonary hypertension
  • Heart failure
  • Women’s heart health

Board Certifications

  • Interventional cardiology
  • Cardiovascular disease
  • Nuclear cardiology
  • Cardiovascular computed tomography (CT)
  • Internal medicine

Professional Memberships

  • American College of Cardiology, Fellow (FACC)
  • Society of Cardiovascular Angiography and Interventions, Fellow (FSCAI)
  • American Society of Nuclear Cardiology
  • Association of Black Cardiologists



Lorena W. Williams, APRN-BC   

Board Certified: Adult Nurse Practitioner

Lorena is a board certified Adult Nurse Practitioner with particular interest in cardiovascular disease. She received her Bachelor of Science in Nursing from James Madison University in Harrisonburg, Virginia. She then received her Masters of Science in Nursing from the University of North Carolina at Chapel Hill. She then returned to her home to care for the hearts of Washingtonians. She worked at George Washington University Hospital for 9 years, caring for patients with chest pain, arrhythmias, heart failure, cardiac bypass and valve surgery, and cardiac catheterizations, or heart rhythm devices.

Lorena is passionate about resuscitation science, after years of caring for patients at UNC Healthcare's Coronary Care Unit as a registered nurse. She now teaches First Aid and CPR through the American Heart Association. She strives to make her community better by teaching as many people about CPR as possible. Lorena tries to treat each patient as if they were her family member, and tries to ensure her patients understand their disease and medications.

In her spare time, Lorena can be found chasing around three toddlers and a spoiled puppy dog. She is an avid Carolina Tar Heels basketball fan (Go Heels!). She enjoys cooking food that is not cardiologist approved, fixing cars, and singing engagements in the area. She plans to open a franchise of a fried chicken chain in Washington, DC someday to ensure her job security. (ha!, no but seriously)


  • Masters: University of North Carolina, Chapel Hill, Chapel Hill, NC
  • Bachelors: James Madison University, Harrisonburg, VA


  • Adult cardiovascular medicine
  • Womens heart health

Professional Memberships:

  • American Heart Association 
  • American College of Cardiology


If you are looking for a cardiologist who specializes in interventional and general cardiology in the Washington, DC area, request an appointment online or call us today at (202) 466-3000.

American College Cardiology American Heart Association American Society of Nuclear Cardiology American Board of Internal Medicine