I am now a retired Professor Emeritus. I taught in the education department at Simpson College in central Iowa. Among other courses, I taught the elementary mathematics methods course and occasionally the mathematics for elementary teachers course. I am particularly interested in (a) teaching kids to use [i]GeoGebra [/i]as a mathematical tool beginning in elementary school, (b) teaching geometry with [i]GeoGebra[/i] at the elementary and middle grades, and (c) specific teaching methods, strategies, or models that can be used to plan [i]GeoGebra[/i]-based instruction.