Colleen was a long-time high school physics and mathematics teacher and Modeler in Sacramento CA. She moved to AZ in 2001 to do graduate studies in physics education research focusing on Modeling classroom discourse. In 2007 she completed her PhD under the direction of David Hestenes. Se was an assistant professor of science education at ASU until 2011 when she transitioned to a half-time research scientist position to take on the role of AMTA’s Executive Officer. In 2014 she retired from ASU to devote her fully attention to AMTA.