He then studied overseas, at the University of Edinburgh (Bachelor's Degree, 1960. Master of Letters in Hebrew and Semitic Languages) and Westminster Theological Seminary (Master of Theology, 1961. Doctor of Theology). In 2003, he was granted an honorary Doctor of Theology from the Australian College of Theology.
He has been described as a "well-known and highly regarded figure in Christian and especially evangelical circles within Australia and overseas."
He also served as Principal of PTC from 1982 to 2001, and is currently Research Professor at that institution. He has also lectured at Tyndale University College and Seminary in Toronto, Reformed Theological Seminary in Jackson, Mississippi and Kosin University in Busan, South of Korea. He has been chairman of Street Andrews Christian College, Tyndale Fellowship (Australia) and the Australian Institute of Archaeology, and is currently chairman of the Australian Defence Force"s Religious Advisory Committee to the Services.
Harman has written commentaries on Psalms (), Daniel (), Deuteronomy (X) and Isaiah ().
He was also one of the translators of the New King James Version. In 2001, a Festschrift was compiled in Harman"s honour, on the occasion of his retirement and 65th birthday.
Contributors included Richard Gaffin and Peter Jensen.
He is a member of the board of directors of the World Reformed Fellowship, and has been an editor of the Reformed Theological Review since 1989.
Married Mairi Murchison, May 20, 1961. Children: Ruth, Linda, Kenneth, Philip, Christine.