ACM President Vicki Hanson, Conference Chair Craig Partridge, and Dame Wendy Hall give introductory remarks at ACM’s Celebration of 50 Years of the A.M. Turing Award. Computing visionaries from the last half century, including 22 ACM Turing Award recipients, participated in this two-day conference at the Westin St. Francis in San Francisco June 23 – 24, 2017. The event celebrated the first 50 years of the ACM Turing Award and the visionaries who have received it, and reflected on the evolution of computing and explore where the field is headed.