This book reflects the culmination of my experiences as a mathematics educator since I first began my career as a high school mathematics teacher about 20 years ago. That journey has been a process of learning from and with students, families, and other educators that math will not save us from the social injustices that plague us. Instead, we must be the ones to shape mathematics into a tool that facilitates exploring, understanding, and responding to social injustice as it exists both within and beyond the mathematics classroom. Finally, the two lesson plans that I contributed to this book both capture yet another guiding principle in my work as a scholar activist: collaboration is crucial to advancing change towards a more socially just world.