Moisseiff was born in
Riga, Latvia (at the time,
Russian Empire), to a
Jewish family. He started his education there and studied at the Baltic Polytechnic Institute for three years; he emigrated to the United States with his family at the age of 19, in 1891, because of political activities. In the US, he graduated from
Columbia University with a degree in civil engineering in 1895. elaborated on Moisseiff's theories, and applied them in the design of the famed
Golden Gate Bridge. Moisseiff served as a consulting engineer on the bridge, but declined to speak up for his colleague Charles Ellis On occasion, Leon Moisseiff was involved in resolving tensions between workers and their employers. In 1914, Benjamin Schlesinger of the International Ladies Garment Workers Union (ILGWU) contacted Leon Moisseiff to assist in convincing the clothing manufacturers of Philadelphia to come to an agreement with the union before a major strike broke out. (Lorwin, pp. 277–278) ==Death and legacy==