After Graduating from Ripon College, John C. Diedrich came to work for his father at The Diedrich Agency in 1965.  Then in 1967 John purchased the agency from his father. By this time the agency had doubled the number of companies they represented.  Expansion continued first with the  Fond du Lac branch opening in 1971, followed by the Berlin branch in 1990 and in 1995 the Oshkosh branch was opened.  These four branches have been successful in offering a quality insurance product and the highest level of professional service.