Feb 08, 2017 · Maslen Thomas E Office 7525 Greenway Center Dr Ste 312 Greenbelt, MD 20770 (301) 220-0200 ACCEPTING NEW PATIENTS Specialties Dr. Thomas Edward Maslen has the following specialty Internal Medicine Specialty Expertise Dr. Thomas Edward Maslen has the following 7 areas of expertise Check-up Immunization Weight Loss Physical Weight Loss (non ….