Party affiliation: Republican Party
- He moved to Wisconsin and edited the Superior Evening Telegram in 1890 and 1891. In 1891 he engaged in editing and publishing the Poughkeepsie Eagle; was also a member of the board of water commissioners of Poughkeepsie. Platt was elected as a Republican to the Sixty-third and to the three succeeding Congresses and held office from March 4, 1913 to June 7, 1920, when he resigned to accept appointment by President Woodrow Wilson to the Federal Reserve Board. While in the House of Representatives, he was chairman of the Committee on Banking and Currency (Sixty-sixth Congress). Platt became vice governor of the Federal Reserve Board in August 1920 and served until 1930 when he resigned. He returned to Poughkeepsie and engaged in an extensive banking business.
Born February 2, 1865
Died August 7, 1939