Sara Van Der Werf is a nationally board-certified teacher who taught secondary mathematics for Minneapolis Public Schools for more than 25 years. In addition to teaching math, Sara led the professional development, curriculum writing and strategic planning for K-12 mathematics at the Minneapolis district office. Sara served in multiple positions on the Minnesota Council of Teachers Mathematics board, most recently as past-President. Sara frequently speaks at the state and national levels, including keynoting conferences and leading professional development on a variety of topics. Sara is active in the national mathematics community via twitter, @saravdwerf, and her blog, saravanderwerf.com. Sara is passionate about encouraging and connecting mathematics teachers. In addition, Sara is on a mission to empower PreK-12 grade students to embrace positive mathematical identities.