Dr. Johnson is the founder of the Asian Theological Seminary and has taught extensively overseas, including the Philippines, Poland, the former Czechoslovakia, Romania, and Russia. He also has ministered in Austria, Brazil, England, Germany, Israel, and Scotland. Dr. Johnson joined the Seminary as afaculty member in 1972 and as a pastor of a Dallas-area church the same year. He is a member of the Evangelical Theological Society (ETS).