William R. Halliday

William Halliday is a security professional with four decades of experience in the areas of security and investigations, including establishing and managing global security organizations and programs, developing crisis management and response plans, and providing risk management and organizational security consulting services for clients.

He has a broad range of practical expertise including physical security design and program implementation; travel risk management and personal protection; management and implementation of health & safety programs; internal investigations, and the development and implementation of crisis management and incident response programs, including pandemic planning and response.

Prior to joining RosettiStarr he served as the Director of Global Security for Marsh McLennan, the world’s leading professional services firm in risk, strategy and people, with 90,000 employees worldwide providing services to clients in 130 countries. In that role, he also oversaw the firm’s health and safety programs, chaired the firm’s Health & Safety and Workplace Violence Prevention Committees and served on the firmwide Crisis Management Team. Prior to that, he was a VP for Corporate Security at Morgan Stanley and an Associate Managing Director at Kroll Associates, where he provided security consulting and investigative services for a variety of Fortune 500 companies. He began his career as an investigator for the NYC Department of Investigation, including serving as the Assistant Director of their Information Systems and Information Security Bureau.

BS in Criminal Justice from John Jay College of Criminal Justice, with honors