The annual George E. P. Mountcastle Memorial Lecture brings a distinguished writer to Gilman School each year to give a formal address and spend a day in informal conversations with students and faculty. The lectures are delivered to an audience of Gilman students and faculty, invited friends and relatives of the Mountcastle family, and a limited number of students and faculty from other schools. The Mountcastle Lecture has been established and endowed at Gilman School as a memorial to George E. P. Mountcastle '68 by his family and friends.
George Mountcastle's strongest interest was in modern literature. As such, his family requested that most of those chosen to give the lectures be young writers. However, George was also concerned with the moral and ethical positions a man should take in an increasingly agnostic and secular world. Accordingly, in some years, a philosopher who has addressed him or herself to the dilemmas of modern man will deliver the lecture. Those who come to Gilman to deliver the George E. P. Mountcastle Memorial Lectures represent the kind of achievement toward which George was striving before his death.