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Rock Sleyster (1879-1942)
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The National Encyclopedia of American Biograph (1967)

SLEYSTER, Rock, psychiatrist, was born in Waupun, Wis., June 14, 1879, son of William and Addie (Butts) Sleyster, and grandson of Jan William Sleyster (this must be Roelof Sleyster, HWS), a native of Arnheim, the Netherlands, who emigrated to the United States in 1846 settling in Waupun.

His father was grain merchant. Following his graduation at the medical school of the University of Illinois in 1902, Rock Sleyster practiced medicine in Appleton, Wis., until 1907, when he returned to Waupun to become medical director of the Central State Hospital, an institution for the criminal insane. Here he continued for twelve years, and during 1912-14 he served as mayor of Waupun.

In the first World War, as a major in the U.S. army medical reserve corps, he acted as medical aide to the governor of Wisconsin. In 1919 he was appointed medical director of the Milwaukee Sanatorium, Wauwatosa, Wis., and held this post until his death. From 1915 until 1921 he was chief of the bureau of postgraduate medical instruction at the University of Wisconsin, and during 1918-24 was editor of the Wisconsin Medical Journal.

He was a trustee of the Northwestern Mutual Live

Insurance Co. and of the medical school of Marquette University, and he was a director of the National Tuberculosis Association and of the Wisconsin Anti-Tuberculosis Association.

He was a fellow of the American College of Physicians, and he was a member of the American Medical Association (pres. 1939-40), the American Psychiatric Association, the American Association for Research in Nervous and Mental Diseases, the Wisconsin State Medical Society (pres. 1924), the Chicago Neurological Society, the Chicago Institute of Medicine and the Milwaukee Academy of Medicine.

He was a Mason, and belonged to the University and Milwaukee Country clubs. The Wisconsin State Medical Society awarded him a gold seal in 1934 for his "devotion to the individual needs of the mentally sick," and in 1941 Marquette University conferred on him the LL.D. degree affiliation was with the Protestant Episcopal church.

He was married in Darlington, Wis., Apr. 15, 1903, to Clara Sarah, daughter of John Vincent Swift, a merchant, of that place. His death occurred in Wauwatosa, Wis., Mar. 7, 1942.

From: Who Was Who in America
Vol.III 1943-1950 CT 103 W69 V.2

SLEYSTER, Rock, psychiatrist; b. Waupun, Wis., June 14, 1879; s. William and Addie (Butts) S.; M.D., U. of Ill., 1902; han. LL.D., Marquette Univ., Milwaukee, 1941; m. Clara Sarah Swift, Apr. 15, 1903. Private practice as physician, Appleton, Wis., 1902-09; med. dir. Central State Hosp., Waupun, Wis., 1909-19; med. dir. Milwaukee Sanitarium, Wauwatosa, Wis., since 1919. Trustee Northwestern Mutual Life Ins. Ca., Marquette U. Med. Sch., Wis. Anti-Tuberculosis Assn. Served as maj. Med. Corps, U.S. Army. during World War. Awarded gold service medal by Wisconsin Med. Soc. and American Medical Association. Fellow Am. Coll.

Physicians (former mem. bd. gors.), Am, Med. Assn. (chmn. bd. trustees 1926-37; pres. 1932); mem. wis. Med. Soc. (past pres.), Am. Psychiatric Assn., Chicago Neurol. Soc., Chicago Inst. of Medicine, Milwaukee Acad. Medicine, Am. Assn. for Research in Nervous and Mental Diseases, Alpha Mu Pi Omega; hon. mem. Chicago Med. Soc. Republican. Episcopalian. Clubs: University, Milwaukee Country (Milwaukee). Editor of Wis. Med. Jour., 1917-22. Contbr. to med. jours. Home: 1229 Dewey Av., Wauwatosa, Wis. Office: Milwaukee Sanitarium, Wauwatosa, Wis.; Marshall Field Annex, Chicago, Ill. Died Mar. 7, 1942.

1916 - 1920 Chief of Extension's Bureau of Postgraduate Medical Instruction