I was a 20+year high school physics and mathematics teacher and Modeler in Sacramento CA. In 2001 I moved to Phoenix, AZ to do graduate studies in physics education research focusing on Modeling classroom discourse. In 2007 I completed my PhD under the direction of David Hestenes. I was an assistant professor of science education at Arizona State University until 2011 when I transitioned to a half-time research scientist position to become AMTA’s first Executive Officer. In 2014 I retired from ASU to devote my fully attention to AMTA. In 2017 I “retired” from the XO position and became AMTA’s first Senior Fellow. I continue to write grants, conduct research, teach occasional courses in modeling and cognition, train workshop leaders, and publish on Modeling Instruction. My current research interests are computational modeling, teacher leadership, out-of-field science teaching, and cognition in Modeling Instruction.