Having begun preaching at age fifteen, he has preached the gospel for over forty years, serving congregations in Clarksville, Hot Springs, and Blytheville, Arkansas. He has preached in more than 850 gospel meetings in thirty-five states of the USA and in several other countries, including England, Singapore, Ukraine, and India. Cloer teaches Bible and preaching classes at Harding University.
Since 1981, Cloer has edited and published Truth for Today, a monthly publication for preachers and teachers. In 1990, with the help of World Bible School teachers and the Champions church of Christ in Houston, Texas, he began Truth for Today World Mission School. Its expository Bible studies assist nearly 40,000 preachers and teachers in more than 140 countries.