He worked in the Washington, D.C. office of Federal Emergency Relief Administration (FERA).
Early in his professional career he worked in Tampico, Mexico for Gulf Oil as a civil engineer.
[1]: 4–5 In 1935, he met with President Franklin D. Roosevelt, who was "fascinated" with David's ideas.
[1] A number of his works are listed on the U.S. National Register of Historic Places.
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