Rob Callison hails from Grand Junction, Colorado. 1980 was a pivotal year for Rob. In the spring of that year, he joined the Navy and accepted Christ as his Lord and Savior. From 1980 until the end of 1985, he served as an active-duty Surface Warfare Officer in the Navy. In 1986 he entered Westminster Seminary in California where he graduated in 1989 with a Master of Divinity. He was later ordained as a Teaching Elder in the Presbyterian Church in America.

In 1992 he entered active naval service once again, this time as a Navy chaplain. During the next 21 years he served in various capacities as a chaplain to units in both the Navy and Marine Corps to include a one-year tour with the 2nd Marine Air Wing in Iraq.

In addition to an M-Div from Westminster Seminary, Rob holds an MA in Theology from Washington Theological Union in Tacoma Park, MD (2000) and a D-Min from Reformed Theological Seminary in Orlando, FL (2012).

Since 2016 Rob has also served as an assistant pastor at Riveroaks Reformed Presbyterian Church in Germantown, TN.

In December 2018 he married his long-time friend, Teresa Crivello. They have an adult child, Katherine, through a previous marriage.