Hi there sarap and welcome to the site.
I think Stephen Briggs is is Discworld personified!
He created the Discworld maps, the Discworld Companion, he has adapted the books as plays and played in those plays.
I've listened to audiobooks by Nigel Planer and Stephen Briggs and, while I think Nigel is very good, Stephen has the edge for me. His characterization is, generally, excellent. Nobody (with the exception of Terry) knows his way around Discworld better.