Craig was born in Wilmington, Delaware and raised in the Presbyterian Church of America. While receiving his degree in psychology from the University of Delaware, he met Kim, who was working toward a degree in nursing. Kim, born in Wilmington also, accepted the Lord when she was eight years old. They married in 1988, and after several years away from the church, they fully committed their lives to Christ in 1995. Craig owned a painting business when the Lord called him to seminary in 1998. He and Kim moved their family to Rock Hill, South Carolina, where Craig began attending Reformed Theological Seminary in Charlotte for ordination in the PCA.

After three short-term mission trips to Central America, they found their hearts captured by the Belizean people. In Belize, Craig will teach high school Bible and theology at the Presbyterian school, disciple and equip leaders in the church, and preach and teach when called upon.

Kim will homeschool their children and use her nursing skills at the Presbyterian Medical Clinic in Patchakan Village. Pray that the Marshalls will seek to glorify God by faithfully sharing the love of Christ with the people of Belize.