Claim: Mark Eisner was a prominent lawyer, served as Collector of Internal Revenue and he was responsible for administering the War Tax Law.
Evidence: Mark Eisner was a prominent lawyer, tax expert, and politician. Eisner served as Collector of Internal Revenue for the Third District (New York) from 1915 to 1919. In that capacity, he was responsible for administering the War Tax Law, which laid the groundwork for an expanded personal federal income tax law enacted by Congress in 1917.