He was ordained in the Reformed Churches in the Netherlands (Liberated), having studied at its Theological College in Kampen and at the University of Amsterdam.
He served as a pastor before being appointed as Professor of Ethics at Kampen in 1970, where he served until his retirement in 1997.
[2] Douma wrote a fifteen-volume series called Ethical Reflections,[3] as well as a series of biblical commentaries.
Geoff Thomas noted in 1999 that he was best known in Britain for his friendly interaction with Reformed Baptists.
[4] In 2014 Douma left the Liberated churches to join the Reformed Churches in the Netherlands (Restored).