John (Jack) Sullivan is a subject matter expert on highway-incident operations and emergency personnel safety. He was a volunteer firefighter and chief officer for 25 years and recently retired from a 40-year career as a safety and loss control consultant for the public and private sector. Sullivan teaches Traffic Incident Management & Responder Safety Workshops for emergency responders for the Emergency Responder Safety Institute. He is a Master Instructor for the Federal Highway Administration’s SHRP2 Traffic Incident Management Train-the-Trainer Workshops. Sullivan is a Technical Member of the National Committee on Uniform Traffic Control Devices and serves as the chair of Committee’s Task Group for Chapter 6i (Control of Traffic Through Traffic Incident Management Areas) of the Manual on Uniform Traffic Control Devices.