 He is the former mayor of Urbandale, serving from 1998 to 2005 and a former city council member of Urbandale, serving from 1996 to 1998.He is former owner of Zaun's Hardware and Vice President of R&R Realty Marketing Group, and received his Bachelor's degree from Grand View College.Zaun currently serves on several committees in the Iowa Senate – the Judiciary committee; the Labor and Business Relations committee; the Rules and Administration committee; the Transportation committee; and the Ways and Means committee, where he is the ranking member.