Similar to many criminologists, my interest in pursuing this career was driven by a desire to improve responses to injustices, on both small and large scales. I believe that among criminologists, this dedication to effect changes in social and legal justice disproportionately drives those of us historically kept out of the academy due to our race, gender, class, sexual identity, and/or other marginalizations. Fortunately, there is a growing diversity among criminologists and this has had a powerful impact on expanding the scope and depth of the field. At the same time, I am concerned that academic training and university climates frequently work against our commitment to advancing social and legal justice changes, what I refer to as “criminology activism.” This address is a call to action, stressing criminologists’ responsibility to advocate for social and legal justice on small and large scales. Numerous types of criminology activism are identified (e.g., in research, service, and teaching), including the requisite to continue diversifying the representation of criminologists.