Larry and Linda Keller of Ottumwa announce the engagement of their daughter, Lisa Keller of Des Moines, to Michael Casper of Des Moines. He is the son of Doug and Jeanette Casper of Hinton.

The couple plans an Aug. 25, 2007, wedding in Ottumwa.

Lisa is a 2002 graduate of the University of Iowa, receiving a degree in finance. She is an auditor for the iOwa Department of Revenue in Des Moines.

Michael is a 2003 graduate of the University of Iowa, receiving a degree in marketing and communications. He is a defense contracting specialist for the United States Air Force in Des Moines.