In 1948, Watts was a member of the founding faculty of the International Baptist Theological Seminary, Rüschlikon in Switzerland where he taught Old Testament.
[1][3] After his retirement, he returned to teach for one more year at the International Baptist Theological Seminary in 1995–1996, which had by that time moved to Prague in the Czech Republic.
[4] Among the seminarians who studied during that period include, D. K. Sahu,[5] the present Dean of the Theology Department of the Sam Higginbottom Institute of Agriculture, Technology and Sciences, Allahabad,[6] and others.
While at Fuller Seminary, Watts was recruited to serve as the Old Testament editor of the Word Biblical Commentary, which he continued to do until 2011.
[8] Later in 2008, when a special edition on the Watts' contribution was brought out by the Baylor University, Pamela J. Scalise of the Fuller Theological Seminary compiled a bibliography of his writings.