Moisei Ginzburg was an architect, theorist, teacher and a leader of the Constructivist group in Soviet avant-garde architecture. His magnum opus, Style and Epoch (1924), emphasized the civilizing role of the machine and its capacity to rationalize new building types consistent with the needs of the working class. Asserting that the revolution had engendered a new constructive phase of architectural development, Ginzburg¿s treatise was essentially a manifesto of Constructivism as the architectural style of the new Soviet era.