A pastor in the Free Church of Scottland, Roberts is a solid and insightful preacher. He was an editor of the Banner of Truth magazine from 1988 to 2003. My first introduction to him was an impossible-to-put-down book that was a collection of articles he had written for Banner of Truth, and these books are listed in a previous post. He currently ministers to at Iverness Greyfriars.
Listed are a number of places on the web to find his sermons on audio: