This report, sponsored by NCWIT's Workforce Alliance, provides an inside look into how men think about  and advocate for diversity in the technical workplace. Drawing from interviews with 47 men in technical companies and departments, this study: 1) Identifies the factors that motivate or hinder men in advocating for gender diversity, 2) explores what diversity efforts men have experienced as successful or unsuccessful, and 3) identifies specific strategies to increase men's participation in advocacy.