Engaged Hannah Gehm and Eric Mosterd, both of Vermillion, announce their engagement. The bride is the technology modules teacher and technology coordinator at the Vermillion Middle School.�? The groom is the eLearning coordinator at The University of South Dakota. Hannah is the daughter of Cindy Gehm of Vermillion and John Gehm of Sioux Falls. Eric is the son of Nancy Shaddy of Larchwood, IA. An Oct. 18 wedding in Vermillion is planned.