William E. Slemmons was a prominent 19th century clergyman and academic in Western Pennsylvania.

[1] He gave the Master's Oration at the Princeton commencement in 1880, a speech entitled "Literary and Academic Exclusiveness."

The New York Times called it an "extremely practical view of the caste feeling existing between high institutions of learning and the common every-day world.

"[2] In 1894, while serving as a pastor in Mercer Second Presbyterian Church, Slemmons was a delegate for the Pennsylvania Synod to the 106th General Assembly of the Presbyterian Church in the United States.

He served on the Church Erection Committee and was involved in a protest against a declaration against a resolution from the "Committee on Temperance" declaring "no political party has the right to expect the support of Christian men so long as the party...refuses to put itself on record against the saloon.