Abstract Professor of mathematics, 1946-1982; coordinator of National Science Foundation Mathematics Summer Institute, 1960-1974. The collection includes correspondence of Jay Folkert and from friends and relatives to J. H. Koopman of Overisel, Michigan, death notice of Henry Kollen, school certificates of Geziena Kollen Koopman, Overisel Centennial Calendar, reports, photographs, articles, biographical information, his World War II memories in written form, oral history audio file and transcript...