I just got word via my Facebook feed that Mayer Zald passed away this morning. He was a prolific scholar best known among us social movement people for two foundational papers with John McCarthy on resource mobilization. His major academic focus was on the organizational dimensions of social movements. He was also a warm and engaged human being who mentored several generations of younger scholars with scholarly engagement with their ideas and useful advice about their work. He will be sorely missed. Our condolences to his family and to the many people who knew him as a friend.