From 1935 to 1938 Claszen served on the hymnal committee of the Conference of Mennonites in Canada. During the 1950s, he was frequently consulted by scholars, musicians, and historians. From 1960 to 1965 he served as consultant for the new Gesangbuch der Mennoniten (1965). His significant influence on this hymnal resulted in further contribution of his hymnological expertise to the Mennonite Hymnal (1969). Claszen also conducted significant research into Anabaptist hymnology. His papers and manuscripts are housed in the Mennonite Heritage Centre, Winnipeg, Man. His large library of books on hymnology is part of the library of Canadian Mennonite Bible College and the rare book collection of the Heritage Centre.
Berg, Wesley. "Gesangbuch, Ziffern und Deutschtum: A Study of the Life and Work of J. P. Claszen, Mennonite Hymnologist." Journal of Mennonite Studies 4 (1986): 8-30.
Berg, Wesley in Mennonite Mirror 15 (September 1985): 9-11.
 Cite This Article
Wiebe, George. "Claszen, Johann Peter (1891-1974)." Global Anabaptist Mennonite Encyclopedia Online. 1990. Web. 25 Jan 2015. http://gameo.org/index.php?title=Claszen,_Johann_Peter_(1891-1974)&oldid=86844.
Wiebe, George. (1990). Claszen, Johann Peter (1891-1974). Global Anabaptist Mennonite Encyclopedia Online. Retrieved 25 January 2015, from http://gameo.org/index.php?title=Claszen,_Johann_Peter_(1891-1974)&oldid=86844.
Herald Press website.
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