Collaborate or Perish: Reaching Across Boundaries in a Post-9/11 World is a 2012 book co-authored by Bill Bratton (William J. Bratton, former New York City Police Commissioner) and Zachary Tumin. The book examines the critical need for collaboration among law enforcement, government agencies, private sector entities, and communities to enhance public safety and counterterrorism efforts in the aftermath of the September 11, 2001 attacks. Drawing on Bratton's experiences, it advocates for breaking down silos and fostering partnerships to address complex security challenges, using real-world examples from counterterrorism operations and urban policing. The book emphasizes that isolation leads to failure in modern threat environments and provides strategies for building effective networks of influence and cooperation.