Fred Saul Rosen (May 25, 1930 – May 21, 2005) was a pediatrician and immunologist at Harvard Medical School and Boston Children's Hospital.
He received his bachelor's degree from Lafayette College and his MD from Case Western Reserve University.
He moved to Boston in 1955 to begin a pathology residency at Children's where he worked with Charles Janeway and Sidney Farber.
He and Janeway pioneered the study of primary immunodeficiency diseases at Boston Children's Hospital.
[3] Rosen was the head of the division of immunology at Boston Children's Hospital from 1968 to 1985.