All course instructors, including MEC leaders Ruth Parker, Patty Lofgren, and Debbie Olson, are dedicated to making MEC’s vision and mission a reality. They each have years of successful experience as classroom teachers and extensive experience working with adults. Their knowledge of mathematics, how children learn mathematics, and pedagogical content knowledge enrich MEC sessions and materials development.

#### Cathy Humphreys – MEC consultant and high school mathematics teacher.

Cathy has 30 years of experience as a teacher of grades 2-11. She has been active in professional development for teachers throughout her career, both as an in-service leader at the local, state, and national levels, as an instructor for pre-service secondary mathematics teachers in the Stanford Teacher Education Program, and as a middle school mathematics coach. She is the co-author of three books: *A Collection of Math Lessons for Grades 6-8*, with Marilyn Burns (1990); *Connecting Mathematical Ideas: Middle School Video cases of Teaching and Learning*, with Jo Boaler (2005); and, most recently, *Making Number Talks Matter: Developing Mathematical Practices and Deepening Understanding, Grades 4-10*, with Ruth Parker (2015). Currently Cathy recently completed her PhD in mathematics education at Stanford University.

#### Lisa Mesple – MEC consultant, elementary teacher, math specialist, and math consultant.

Lisa has 25 years experience teaching kindergarten through fifth grades in Boulder, Colorado as well as providing professional development for teachers. After retiring from Boulder in 2008, Lisa worked on staff for MEC and for the Math Recovery Council. She is currently teaching mathematics for pre-service teachers at the Center for Urban Education through the University of Northern Colorado. Lisa has been a leader at both the district and state levels. She is a recipient of the Eleanor Roosevelt Fellowship from the American Association of University Women and the Presidential Award for Excellence in Mathematics and Science. Lisa has taught MEC courses since 2001.