Rosie Olander, daughter of John and Marian Olander, and Nick Thelen, son of Dean and Teresa Thelen, are pleased to announce their engagement and upcoming wedding.

Olander, of Aurora, Ill., is a senior at Iowa State in environmental science.

Thelen, of Des Moines, is an alumnus of Iowa State with a degree in psychology.

The couple plans to marry on April 21, 2012, in Des Moines.