Trained as a civil engineer, linguist, cultural anthropologist and Presbyterian minister, he describes himself as a "Christian social engineer." Working through the William Carey International University and the U.S. Center for World Mission, which he founded, he is producing a new generation of Christian message carriers, some native, ready to venture out to places with such ready-to-be-ministered flocks as Muslim converts to Christianity and African Christians with heretical beliefs. Says Winter: "It's this movement, not the formal Christian church, that's growing. That's our frontier."