Walter Weyl was an intellectual leader during the Progressive Era, and a founder of The New Republic magazine. Walter Lippmann wrote of Weyl that "He was by far the best trained economist in the progressive movement. He was the only active Bull Moose I ever knew who thought the Progressive program could be justified by statistics of the social facts as well as by moral denunciation."
His son was Nathaniel Weyl.
Weyl wrote in his best known work The New Democracy(1912) that Marxism (which he called "absolute socialism") is "essentially religious." Despite being anti-Marxist, Weyl was a committed progressive.