Bishop Scott was ordained a priest in 1995 and served as associate pastor, hospital chaplain, parish administrator, and director of formation for the Companions of the Cross from 2000 to 2006. He served two terms as Superior General of the Society from 2006 to 2016. In 2016, he was appointed by Pope Francis as Bishop of the Military Ordinariate of Canada, which addresses the diverse spiritual and pastoral needs of military personnel and their families.

Bishop Scott serves on the board of directors of Renewal Ministries Canada and has participated in missions in more than 15 countries in Africa, Eastern Europe, and Southeast Asia. He is also a board member of Life Restoration Ministries and an episcopal advisor for Catholic Christian Outreach, Spiritual Motherhood of Priests, and God Squad Men's Movement. He regularly participates in the spiritual and pastoral formation of members of these various apostolates. He is currently pursuing a master's degree in catechesis and is the author of "Clothed with Power from On High: A Short Catechesis on Charisms in the Life and Mission of the Church."