Marcus received his BS degree from the Case Institute of Technology in Polymer Engineering and worked for six years as an engineer. During this time, he was involved in a variety of Protestant youth and music ministries. He then received his Master of Divinity Degree from Gordon-Conwell Theological Seminary and was ordained to the Protestant pastoral ministry. During his more than fifteen years of youth, young adult, and pastoral ministry, his main emphasis was church and lay spiritual renewal. Marcus, his wife Marilyn, and their two older sons, JonMarc and Peter, were received into the Catholic Church on December 20, 1992. Their third son, Richard, entered through baptism at the invitation of Mother Angelica. Marcus began to host the Journey Home program in 1997.