“Excellent patient care is a collaboration between you and your physician. It is our goal to show respect for your personal and cultural values and provide the highest quality advice so that you may make informed healthcare decisions. We hope to show you how caring about the whole person enhances health and well-being.”

Board Certification

  • Internal Medicine

Areas of Expertise

  • Acute Illnesses
  • Cardiovascular and Endocrine Diseases
  • Comprehensive Chronic Care
  • Preventive Care- Risk Factor Management


Internship and Residency

University of Maryland Medical System
Internal Medicine
Baltimore, MD
1998 and 2000

Medical School

University of Maryland School of Medicine
Doctor of Medicine
Baltimore, MD

Undergraduate School

Catholic University of America
Bachelor of Science in Civil Engineering
Washington, DC

Professional Association

American College of Physicians
1997 – Present

Personal Interests

Dr. Maslen enjoys spending time with family, golf, and gardening.


Dr. Maslen started his professional career in civil engineering and building construction management after graduating from the Catholic University of America in 1982. He worked on numerous projects in the Washington DC metropolitan area before attending the University of Maryland School of Medicine. He graduated Magna Cum Laude in 1997 with multiple academic honors including AOA. He remained at the University of Maryland for residency and was awarded the outstanding senior resident award.

In 2000, Dr. Maslen joined an established practice in Greenbelt, MD and upon his mentor’s retirement, the practice has once again used the solo physician practice model. He believes that this environment maximizes patient-physician relationship development and quality of care. He also has an active practice at a highly rated assisted living and nursing home facility.

Dr. Maslen has received consistently high patient ratings on online sites, such as Healthgrades.com and Vitals.com and has been listed in Checkbook Magazine as a top physician on multiple occasions.