On June 2, 1891, Slater married Eva Elizabeth Sours (died 1950), and continued the practice of law in
Port Chester, his wife's hometown. He was Counsel of the
Town of Rye from 1900 to 1906, and a Trustee of the Village of Port Chester from 1902 to 1908. He was a member of the
New York State Assembly (Westchester Co., 4th D.) in
1912. In the Assembly, he was first to make a speech advocating suffrage for women. He was a member of the
New York State Senate (24th D.) from 1915 to 1918, sitting in the
138th,
139th,
140th and
141st New York State Legislatures. In November 1918, he was elected Surrogate of Westchester County, and was re-elected in 1924, 1930 and 1936; remaining in office from 1919 until his death in 1937. Slater died on February 23, 1937, in Moore County Hospital in
Pinehurst, North Carolina, of
appendicitis; and was buried in Rye, New York. Democrat William J. Sheils, whom he had defeated at the election in November 1936, was appointed by Gov.
Herbert H. Lehman to fill the vacancy until the end of the year. ==Sources==