Service

• Reviewer for Journal for Research in Mathematics Education, American Education Research Journal, Journal for Teacher Education, and many professional conferences
• Co-chair, Division C, Section 2 (Learning and Instruction, Mathematics), AERA Annual Convention, 1998
• Mathematics Content Review Panel for “Studies of Enacted Curriculum” project, Cyberchase television series, and the Annenburg professional development video series for algebra
• U.S. Item Selection, OECD Programme for International Student Assessment
• Chair of the Realistic Mathematics Education Conferences in Madison, WI (November 14-15, 2005) and Boulder, CO (November 16, 2005)