In November 2007, on his first mission trip to Southern Sudan, Greg felt a strong desire to quit his secular job and return to Sudan as a full-time missionary. For two and a half years he lived in a tent, travelled by foot, and was even unjustly and severely beaten. During this time, Greg coordinated the construction of three "Hope4Sudan" compounds to serve the Southern Sudanese people. In 2010, Greg left the field for a short time of missions training at SAFARI (Semester Abroad For A Radial Impact) in South Africa. It was there where he officially joined IPHC World Missions Ministries. World Missions requested that he go and coordinate the Clinic and Training/Conference Centre building project in Maputo, Mozambique.
While in South Africa, Greg met Latoya, whom he would later marry. On completion of the Mozambique project, Greg resumed his role as Ministry Director in Southern Sudan. During this time, Greg managed the completion of a massive building project in Kapoeta, and Latoya worked in developing kid's ministry, Sunday schools, and assisted in the health clinic. In Spring 2014, Greg, Latoya, and their infant son, Ethan came back to the U.S in order to itinerate. They have since returned to South Sudan and continue to serve at the Hope4Sudan Compound in Kapeota and focus on developing the ministry at the other two Hope4Sudan Compounds in Southern Sudan