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Dr. Marc Okun

Dr. Okun is President of The Heart Center of Northern Anne Arundel County, P.A. He co-founded The Heart Center with Dr. Kevin Doyle upon completion of his Cardiology fellowship in 1986. He specializes in consultative and preventive cardiology.

Dr. Okun holds a faculty appointment as Clinical Assistant Professor of Medicine in the Department of Medicine/Division of Cardiology at the University of Maryland School of Medicine.

Dr. Okun was born and raised in Baltimore, Maryland. He currently resides in Baltimore County. He is married and has one daughter.


Dr. Kevin Doyle

As of June, 2017, Dr. Doyle has retired.

Dr. Doyle is Vice President of The Heart Center of Northern Anne Arundel County P.A. He co-founded The Heart Center with Dr. Marc Okun upon completion of his Cardiology fellowship in 1986. Clinical interests include consultative and preventive cardiology.

Dr. Doyle holds a faculty appointment as Clinical Assistant Professor of Medicine in the Department of Medicine/Division of Cardiology at the University of Maryland School of Medicine.

Dr. Doyle was born and raised in Baltimore, Maryland. He currently resides in Baltimore County. He is married and has two children.


Dr. David Aiello

Dr. Aiello joined The Heart Center in 1995 after completing his Cardiology fellowship at the University of Maryland Medical Center. Dr. Aiello is board certified in Cardiovascular Diseases and Internal Medicine. He specializes in general and consultative cardiology.

Dr. Aiello holds a faculty appointment at the University of Maryland School of Medicine as Clinical Assistant Professor of Medicine. He is the medical director of the Department of Echocardiography at The Heart Center.

Dr. Aiello was born in Baltimore, Maryland. He currently resides in Severna Park. He is married and has two children.


Dr. Sam Yoon

Dr. Yoon joined The Heart Center in 2002 after completing his General Cardiology and Interventional Cardiology fellowship at the University of Maryland Medical Center. He is Board Certified in Cardiovascular Diseases and Interventional Cardiology, and specializes in Cardiac Catheterization and Coronary Interventional procedures, as well as Consultative Cardiology.

Dr. Yoon holds a faculty appointment at the University of Maryland School of Medicine as Clinical Assistant Professor of Medicine, and he currently serves as the Director of the Cardiac Catheterization Lab at Baltimore Washington Medical Center, overseeing the Primary Angioplasty Program as well as the CPORT-E elective angioplasty Registry Program. In 2011, Dr. Yoon was named a “Top Doc” in Cardiology by What’s Up! Magazine in Annapolis, MD.

Dr. Yoon was born and raised in the Baltimore area, and currently resides in Howard County with his wife and three children.


Dr. Jay Penafiel

Dr. Penafiel joined The Heart Center in 2002 after completing his Cardiology fellowship at the University of Maryland Medical Center. He is Board Certified in Cardiovascular Diseases and Nuclear Cardiology. Under his direction, The Heart Center’s Nuclear Cardiology program achieved accreditation by the Intersocietal Commission for the Accreditation of Nuclear Medicine Laboratories (ICANL). He is presently the medical director of the practice's nuclear cardiology program.

A Baltimore County native who now resides in Crownsville with his wife, two daughters, and one son, Dr. Penafiel's interests include biking. His community involvement includes serving on the board of directors for Katipunan, the Filipino-American Association of Maryland.


Dr. Kelly Miller

Dr. Miller joined The Heart Center in 2007 after completing both her General and Interventional Cardiology fellowship at the University of Maryland Medical Center (UMMC). She is Board Certified in Cardiovascular Diseases and Interventional Cardiology and specializes in Coronary Interventional procedures. Dr. Miller also sees patients for general consultative cardiology, performs trans-esophageal echocardiograms and has special interest in women’s cardiovascular health.

Dr. Miller holds a faculty appointment at the University of Maryland School of Medicine as a Clinical Assistant Professor of Medicine.


Dr. Miller was born in Baltimore and was raised in Glen Burnie, graduating from Glen Burnie High School. She is very proud to return to her hometown to practice medicine. She currently lives in Anne Arundel County with her husband Mark, son Larson and dog City Mouse.


Dr. Andrew Zohlman

Dr. Zohlman joined The Heart Center in 2012 after completing his Cardiovascular fellowship at Boston Medical Center and his Cardiac Electrophysiology fellowship at The Beth Israel Deaconess Medical Center. He is Board Certified in Cardiovascular Diseases and board eligible in Cardiac Electrophysiology.

He specializes in cardiac arrhythmia management, including implantation and follow up care of permanent pacemakers, ICDs and biventricular ICDs as well as catheter ablation of arrhythmias.

Dr. Zohlman holds a faculty appointment at the University of Maryland School of Medicine as a Clinical Assistant Professor of Medicine.


Dr. My-Le Nguyen

Dr. Nguyen joined The Heart Center in 2015 after completing her Internal Medicine training at the University of Maryland Medical Center and Cardiovascular fellowship at Thomas Jefferson University Hospital.  She specializes in general consultative cardiology, trans-esophageal echocardiography, and nuclear cardiology.

Dr. Nguyen was born in Vietnam and was raised in Rockville, MD.  She currently resides in Rockville with her husband and daughter.  She is passionate about supporting the hungry children in developing countries and the Vietnamese Americans in her community. 


Karen J. Daniels, MS, CRNP

Karen J. Daniels joined The Heart Center in 2014. She earned a baccalaureate degree in nursing from the Johns Hopkins University School of Nursing in 1989. She was employed at The Johns Hopkins Hospital for nineteen years as a Registered Nurse in the areas of telemetry, coronary care, surgical intensive care and home care.

She received her Master’s Degree from the University of Maryland School of Nursing in 2007. She is board certified as an Adult Nurse Practitioner and is a member of the Preventative Cardiovascular Nurses Association and the Nurse Practitioner Association of Maryland.


Ms. Daniels was born and raised in Baltimore, Maryland and resides in Miller’s Island with her husband, Labrador retriever and several cats.