Robert B. Callahan Sr.

Robert B. Callahan Sr. founded Callahan & Associates, Inc., in 1976, a telecommunications consulting firm. He is the author of The Triune God Speaks to the Saints, Volume 1 in an eight volume expository commentary on the Apostle Paul's epistle to the Ephesians.
A Treasury of Illustrations and Quotations from Walking with Jesus
Christ's Ambassadors
Satan and God's Armor
Walking Wisely
Following Christ
Walking as Mature Christians
Christ’s Prisoner
Sin and Redemption
The Triune God Speaks to the Saints