Seabury C. Mastick

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Seabury Cone Mastick (July 19, 1871 in San Francisco, California – August 21, 1969 in Manchester, England) was an American lawyer and politician from New York.


He was the son of William Henry Cone and Laura Jeanette (Mastick) Cone. After the death of his parents, he was adopted by his uncle Seabury L. Mastick and his wife Mary Wood Mastick. He attended Hopkins Academy in Oakland, California, and graduated A.B. from Oberlin College in 1891. He graduated LL.B. from University of California Hastings School of Law in 1894, and A.M. from Oberlin College the same year. He was admitted to the bar, and practiced law in San Francisco until 1896.

On October 1, 1896, he married Agnes Eliza Warner (1872–1963), a fellow student at Oberlin from Arlington, New York. The couple settled in Pleasantville, and Mastick practiced law in New York City, specialising in patent law. From 1912 to 1917, he studied chemistry at Columbia University, and in 1916 published Chemical Patents.

From 1917 to 1920, he served in the United States Navy, eventually becoming a lieutenant commander. In the Navy, he developed high velocity star shell artillery ammunition used for illuminating purposes, for which he was awarded the Citation Star. In 1923, he was awarded also the Conspicuous Service Cross. Afterwards he engaged in the manufacture of chemicals, and was President of Westvaco Chlorine Products from 1922 to 1927.

Mastick was a member of the New York State Assembly (Westchester Co., 3rd D.) in 1921 and 1922.

He was a member of the New York State Senate (26th D.) from 1923 to 1934, sitting in the 146th, 147th, 148th, 149th, 150th, 151st, 152nd, 153rd, 154th, 155th, 156th and 157th New York State Legislature. He was Chairman of the New York State Commission for the Revision of the Tax Laws from 1930 to 1938.

On August 21, 1940, he was appointed as Supervisor of the Town of Mount Pleasant.

Pacific University conferred the honorary degree of D.Sc. on him in 1952; and Wagner College the honorary degree of LL.D. in 1953.

On April 3, 1964, he married Kathrin Cawein (1895–1996).

He died on August 21, 1969, in Manchester, while on vacation in England.


New York Assembly
Preceded by
Edward J. Wilson
New York State Assembly
Westchester County, 3rd District

Succeeded by
Milan E. Goodrich
New York State Senate
Preceded by
Holland S. Duell
New York State Senate
26th District

Succeeded by
James A. Garrity