In 15 years of elementary school teaching, Tim earned and renewed National Board Certification as a Middle Childhood Generalist, held multiple leadership positions in the National Council of Teachers of Mathematics, and developed scholarship focused on mathematics teaching practice through the Center for Proficiency in Teaching Mathematics at U-M and the Carnegie Foundation. He studies teacher preparation and professional development through engagement in program and course design, teaching mathematics methods courses, and leading projects funded by NSF and IES focused on the design of professional development materials and the assessment of teaching practice. He earned a PhD in teacher education and a master’s in mathematics education from U-M.