From 1930, he served as executive director of the Baltimore Board of Jewish Education. The same year, he was inaugurated as president of the
Baltimore Hebrew University, which is now merged with
Towson University. Kaplan was also president of the National Council for Jewish Education from 1939 to 1941, and was a member of the board of governors of
Dropsie College beginning in 1940. In 1952, Governor
Theodore R. McKeldin appointed him to the University of Maryland Board of Regents, and later served as chairman for five years until stepping down in 1976. Following the Board of Regents, Kaplan served as interim chancellor of the
University of Maryland, Baltimore County until the next year. From 1975 to 1981, Louis Kaplan served as an interim rabbi at the
Beth Am Synagogue in
Baltimore. ==Legacy==