William Frederick Koch (1885–1967), U.S. medical doctor and pharmaceutical entrepreneur
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William A. Koch (1915–2001), developed what is today known as Holiday World and Splashin' Safari in Santa Claus, Indiana
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He was disinherited by his father, J. Howard Marshall II, after siding with William Koch in Koch's attempt to take over Koch Industries, Inc. from his brother, Charles Koch; Marshall II, who was a board member of the company, and his other son, E. Pierce Marshall, supported Charles.