He then served as president of the National Bible Institute of New York City, and its successor, Shelton College, in Ringwood, New Jersey from 1941 to 1955.
He guided the college through the process of accreditation, bolstered its curriculum (especially in the sciences), increased the percentage of full-time faculty with Ph.D.'s from 24% to 49%, and saw the enrollment grow from 400 to 1,100.
[3] However, Buswell's staunch Calvinism, fundamentalist separatism and his reportedly difficult temperament made his tenure at Wheaton an uneasy one.
(Actually, he believed that the Bible term tribulation only applies to the 2nd half of Daniel's 70th week; thus a so-called "mid-tribulationist" may well call himself a "pre-tribulationist.")
He authored dozens of articles and eleven books, most notably, A Systematic Theology of the Christian Religion, 2 vols.
He was considered a fundamentalist given his firm stand against the modernist accommodation within mainline Protestant denominations and his insistence on holding to the historic fundamentals (basics) of Christian doctrine.