This chapter examines the challenges inherent in helping content area secondary teachers and generalist elementary teachers implement a STEM learning mission. Building capacity for STEM intricately involves transforming teachers of mathematics, science, and other subjects into STEM teachers. Exemplary professional development models are used by meta-cogitators for producing the thinkers who can produce young STEM thinkers. Teacher background information and references are included. This book selection also includes the Table of Contents, About This Book, Acknowledgments, Epilogue, and Index.