In 1957, the philosophy and psychology departments at Harvard invited Oppenheimer to deliver the William James Lectures. An influential group of Harvard alumni led by Edwin Ginn that included Archibald Roosevelt protested the decision. 1,200 people attended Oppenheimer's six lectures, "The Hope of Order", in Sanders Theatre. In 1962, Oppenheimer delivered the Whidden Lectures at McMaster University, which were published in 1964 as The Flying Trapeze: Three Crises for Physicists.