Engineering is poised to make an even greater contribution to society in the next half century than it has made in the past half century. At its annual meeting on September 28-29, 2014, the National Academy of Engineering celebrated the 50th anniversary of its founding. A highlight of the meeting was a forum of distinguished speakers who considered the achievements of the last 50 years and looked toward the potential achievements of the next 50. The Past Half Century of Engineering – and a Look Forward summarizes their presentations.