Thomas K. Johnson received his Ph.D. in ethics from the University of Iowa (1987) after a research fellowship at Eberhard-Karls Universität. He received his M.Div. (Magna Cum Laude) from Covenant Theological Seminary (St. Louis) and BA from Hope College (Michigan). After serving as a church planter in the Presbyterian Church in America, he became a visiting professor of philosophy at the European Humanities University (EHU) in Minsk, Belarus, 1994–1996. (EHU is a dissident, anti-Communist university, forced into exile by the Belarusian dictator in 2004.)
Since 1996 Johnson and his wife have lived in Prague, where he taught philosophy at Anglo-American University (four years) and at Charles University (eight years). From 2004 to 2013 he was director of the Comenius Institute in Prague, which works to develop Czech Christian academic spokespeople. He began teaching for Martin Bucer Seminary in 2003 and has taught theology and philosophy in eleven universities or theological schools in nine countries. His wife, Leslie P. Johnson, was director of the Christian International School of Prague, 2004-2015. She is now an educational consultant for the Association of Christian Schools International. They have three married children and a growing number of grandchildren.
Johnson is presently Vice President for Research, Martin Bucer Seminary; Special Advisor to the International Institute for Religious Freedom (WEA); Professor of Philosophy, Global Scholars; and Senior Advisor to the Theological Commission of the WEA. In 2016 he was appointed
Religious Freedom Ambassador to the Vatican, representing the World Evangelical Alliance and its 600 million members.