"Born in New York, Clarke went to Cornell University to study landscape architecture and civil engineering, graduating in 1913 with a B.S. degree. After World War I, during which he served as an engineer in the U.S. Army, he served on several architectural commissions, ranging from local to federal level. Amongst others, he was a member of the Architectural Advisory Board for the U.S. Capitol and of the New York State Council of Parks. In 1934 he became a consultant for the New York City Parks Department under parks commissioner Robert Moses. His works in the city include the Central Park Zoo, the Conservatory Garden, the expansion of Riverside Park, and many other public spaces. The following year, he teamed up with Michael Rapuano (1904 – 1975), founding the firm of Clarke & Rapuano. From 1935 to his retirement in 1950 he taught landscape architecture at Cornell University, where he was the Dean of Architecture from 1939 on."