Ervin Donaldson is the founder and president of Calvary Christian Ministries. Brother Donaldson lives in Mustang, Oklahoma.

The Donaldson's pastored four different churches over a thirty-nine year span. He has also been involved in missionary work.

Brother Donald says he was smart enough to invite the greatest soul-winning preachers in the world to minister in his pulpit. He credits these men of God and what he learned from them for any success he has seen in the ministry. Most of all, he gives all the glory to God.