Established as successors to
Paul P. Cret, Harbeson, Hough, Livingston & Larson was established in 1945 (following Cret's death) by several of the "associates", all former Cret students:
John F. Harbeson,
William Hough,
William Livingston, Sr., and
Roy Larson. Later the sons of Harbeson, Hough, and Livingston joined the firm, as well as such University of Pennsylvania graduates as
F. Spencer Roach and
Charles Ward. As the older members of the firm retired, the younger generation evolved into
H2L2 in 1976.
In the 1950s Harbeson, Hough, Livingston & Larson excelled in academic design, contributing the Eisenhower Chapel (1956) to the campus of Pennsylvania State University. In the 1960s their involvement with Thomas Jefferson University in Philadelphia produced a campus plan as well as Scott Library. Partner Paul Cret Harbeson's interest in bridge design also led to the office's involvement with the design of the Walt Whitman Bridge in 1959.