I am sorry to share the news with readers that Mayer Zald passed away today in Ann Arbor, Michigan. Mayer was a brilliant sociologist, a founding contributor to the fields of organizational sociology and social movement theory, and a fertile and stimulating voice in conversation with scholars old and young until the final week of his life. He helped to found the Social Theory Workshop at the University of Michigan out of his conviction that there was much to learn from the intersection of sociology and philosophy, and he was a regular and stimulating participant in the workshop. He was an exceptional and generous friend to a wide range of people, from graduate students to professors. I will miss him.