 Hostetler and Huntington published their findings in "The Hutterites in North America" in 1967—it has been reprinted in several new editions since then.In addition to his formal publications Hostetler wrote many research reports, directed six funded research projects, and served as an expert witness in at least five court cases involving minority groups, the most prominent being "Wisconsin v. Yoder", which was heard by the U.S. Supreme Court in 1972.He was an active participant in the National Committee for Amish Religious Freedom.