Drawing on multiple quantitative and qualitative research methods, this collection of essays regarding in-service teacher training provides valuable information to many different stakeholders in mathematics education. Math educators at all levels will find value in the overarching framework that summarizes mathematical knowledge for teaching. Moreover, courses on math methods will benefit from the discussions on the role of teachers in promoting positive dispositions toward math, reducing math anxiety, and combating apathy toward the subject by demonstrating the utility of mathematics. The needs of in-service teachers are also addressed through sections on content-focused professional development as a means of driving instructional change in the classroom. Throughout the volume, the importance of a rich understanding of math is evident, from both mathematicians' and teachers' points of view. This book is well suited for math educators at two- and four-year universities and for those who mentor pre-service or in-service teachers. Summing Up: Recommended. Lower-division undergraduates through faculty.