Randall E. Groth is an Associate Professor at Salisbury University. He brings to the book the experience of a former secondary school mathematics teacher, a current supervisor of student teachers, and a university perspective as secondary-level mathematics educator. As a former secondary teacher, Groth taught all levels of mathematics from remedial pre-algebra, algebra, and geometry to advanced placement calculus. As a supervisor of student teachers, he has seen firsthand the difficulties prospective teachers have as they enter the profession. As a university faculty member, he has taught mathematics education courses for prospective teachers for the past ten years. Groth has also published over 30 articles in peer-reviewed venues for mathematics education and received a distinguished faculty award as recognition of his strengths in teaching, scholarship, and service.