He is chiefly noted for his major contributions as a writer, lecturer and public debater in the field of Christian apologetics. Since 2007 he is Emeritus Professor at University of Bedfordshire, England, where from 1995–2007 he held a full professorship in law and humanities. He is the director of the International Academy of Apologetics, Evangelism & Human Rights, Strasbourg, France, and is the editor of the theological e-zine Global Journal of Classical Theology.
Family
Montgomery traces his ancestry back to Comte Roger de Montgomery who accompanied William the Conqueror in 1066 in the invasion of England. His other titles include Baron of Kiltartan and Lord of Morris, and Comte de St-Germain de Montgommery. Montgomery's more immediate branch of the family hailed from County Antrim in Ireland. His parents were Maurice Warwick Montgomery (owned a retail feed company) and Harriet (Smith) Montgomery. His one sibling, a sister, died in 2008. Montgomery has been twice married. His first wife is deceased. He married Lanalee de Kant, a professional harpist, in 1988. They have an adopted son, Jean-Marie, and two grandchildren, Sarah and William.