Dr. Masin is a physical therapist, faculty member (retired), and researcher. She began her career in 1970. She has worked in a wide variety of settings, including the VA hospital in Bedford, Massachusetts; Easterseals Rehabilitation in Ft. Lauderdale, Florida; St Bartholomew's Hospital in London, England; Hope Center in Temple Hills, Maryland; Prince George's County Public Schools in Landover, Maryland; the Mailman Center for Child Development in Miami, Florida; and the Department of Physical Therapy at the University of Miami, Miller School of Medicine.
Her primary clinical experience has been in early intervention for children 0–3 and their families. She completed her doctoral research and subsequent research on cross-cultural aspects of health care. Her teaching responsibilities have included pediatric physical therapy, communications, clinical education, and supervision. She is also a certified practitioner of neurolinguistic psychology. She has completed multiple journal articles related to pediatric physical therapy, clinical education, and communication.