Paul J. Riccomini, PhD, began his career as a dual certified general education mathematics teacher of students with learning disabilities, emotional and behavioral disabilities, and gifted and talented students in Grades 7–12 in inclusive classrooms. His teaching experiences required a strong content knowledge in mathematics and the development and maintenance of strong collaborative relationships with both general and special educators. He earned his doctorate in special education from The Pennsylvania State University and his master’s degree in education and Bachelor of Arts in mathematics at Edinboro University of Pennsylvania. His research focus is on effective instructional approaches, strategies, and assessments for students with dyscalculia and students who are low achievers and/or students with learning disabilities in mathematics. Additionally, he is a co-author of the bestselling Response to Intervention in Math (Corwin, 2010) and Developing Number Sense through the Common Core (Corwin, 2013). Additionally, Dr. Riccomini provides high quality professional development focused on effective mathematics instruction to school districts across the United States. As a former middle and high school general education and special education mathematics teacher, Dr. Riccomini knows firsthand the challenges and difficulties teachers experience every day when working with struggling students.