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Affiliated with the Local History Network of the State Historical Society of Iowa, and the Iowa Museum Association.
He graduated from LORAS COLLEGE in 1970 and received his master's degree from Loras in 1978. Nilles taught social studies at STEPHEN HEMPSTEAD HIGH SCHOOL for twenty-four years. He also coached the varsity tennis team, freshman football team and softball team from 1970 to his retirement in 1994. He also coached softball at DUBUQUE SENIOR HIGH SCHOOL.
Nilles was a well known referee and umpire in the area for many years. He was a former president of the Tri-State Officials Association, member of the NATIONAL ASSOCIATION FOR THE ADVANCEMENT OF COLORED PEOPLE (N.A.A.C.P.), and the Dubuque Human Rights Commission.
Obituaries. Telegraph Herald, April 15, 1997, p. 3A. Online: https://news.google.com/newspapers?nid=aEyKTaVlRPYC&dat=19970415&printsec=frontpage&hl=en