Dr. Johnson was Professor of New Testament from 1950 to 1972 and Professor of Systematic Theology from 1972 to 1977 at Dallas Theological Seminary. He served as Professor of Biblical and Systematic Theology at Trinity Evangelical Divinity School at Deerfield, IL and also was Visiting Professor of Systematic Theology at Tyndale Theological Seminary, Amsterdam, Netherlands. He accomplished graduate work at the University of Edinburgh, Scotland, SMU, Dallas and the University of Basel, Switzerland. Dr Johnson was engaged in pastoral ministry for about 45 years. He went to be with the Lord on January 28, 2004.