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Willem Kieft (c.1597–1647) served as Director of New Netherland from 1638 to 1647. His authoritarian leadership and conflicts with settlers and Native Americans sparked Kieft’s War, leading to his recall by Dutch authorities.

Jim Kaat (born 1938) is a Dutch American former Major League Baseball pitcher and broadcaster. Over a 25-year career he won 16 Gold Glove Awards and later became an Emmy-winning baseball analyst for NBC, ESPN, and the Yankees Network.

Peter Kiewit (1900–1979) was an American construction executive who transformed his family’s Omaha contracting firm into the global Kiewit Corporation. Under his leadership, the company built major infrastructure projects and became one of North America’s largest construction firms.

Herman Knickerbocker (1779–1855) was a New York lawyer, Federalist politician, and U.S. congressman who represented the Albany region from 1809 to 1811. A descendant of early Dutch settlers, he later managed the Knickerbocker family estate.

Charles G. Koch (born 1935) is an American businessman and chairman of Koch Industries. Under his leadership, the company grew into the world’s largest privately held corporation, expanding from oil refining into diverse global industrial operations.

David H. Koch (1940–2019) was an American businessman, philanthropist, and executive vice president of Koch Industries. A co-owner of the company, he became widely known for major charitable donations supporting medical research, education, and cultural institutions.

Fred C. Koch (1900–1967) was an American chemical engineer and entrepreneur who developed innovative oil refining processes and founded businesses that evolved into Koch Industries, which later became the largest privately held corporation in the United States.

Frederick R. Koch (1932–2020) was an American collector, philanthropist, and eldest son of Koch Industries founder Fred C. Koch. Unlike his brothers, he pursued the arts, building major collections of rare books, manuscripts, and drawings.

William I. Koch (born 1940) is an American businessman and entrepreneur who founded the Oxbow Group after selling his stake in Koch Industries. He is also known for financing the winning 1992 America’s Cup sailing team.

Harry Koch (1867–1942) was a Dutch immigrant, printer, and newspaper publisher in Quanah, Texas. He founded the Quanah Tribune-Chief and was the father of Fred C. Koch and grandfather of industrialists Charles and David Koch.