The couple will be married Dec. 1, 2007, in Des Moines.
Mary is the daughter of Doug and Jeanette Casper of Hinton. She is a 2006 graduate of Iowa State University and is employed by the Johnston Community School District as a second grade teacher.
Chris is the son of Steve and Nola Ryan of Urbandale. He is a 2004 graduate of Iowa State University and is employed by Wells Fargo Financial as a loan officer.