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Murray served as an assistant pastor in the Bible Presbyterian Church in Chester, Pennsylvania. He edited his denomination's publication Faith and Fellowship, later called Truth for Youth, from 1944 to 1950. In 1955, when the denomination split, Murray joined with the Collingswood faction and became president of Shelton College.
Murray led the establishment of the Harvey Cedars Bible Conference in 1941, with the purchase of the historic Harvey Cedars Hotel. In 1960, he left Shelton to start a radio evangelism ministry, Bible Evangelism Inc. Murray co-founded Clearwater Christian College in 1966, serving as the Chairman of the Advisory Board. In 1971, along with Allan MacRae, Murray founded Biblical Theological Seminary. MacRae was Murray's friend and former teacher, and although they had different visions for the seminary (MacRae wanted to train scholar-pastors while Murray wanted to focus on evangelism), they were able to work together.