Lauren Schiller is a Postdoctoral Research Associate and Adjunct Assistant Professor at Teachers College Columbia University. She recently completed her Ph.D. at Teachers College with Dr. Siegler as her advisor. Lauren’s dissertation explored how children understand the relations among rational number notations. Previously, she completed her M.Ed. in Mind, Brain, and Education at Harvard Graduate School of Education, and her B.S. in Special and Elementary Education at Boston University. Prior to graduate work, Lauren implemented mathematics/reading interventions for students with disabilities and taught literacy and ethics at urban schools in Boston. Her major research interests include rational number instruction, mathematical difficulties and disabilities, teacher/student estimation ability, and young children’s number sense.