Here are a couple of links that may help in the future identifying sketch cards, first is from Jen's personal website, it is a little dated but is useful.
Also join Scoundrel and follow the threads on the latest releases, great to identify characters and artists.
When you look at the signature now it is kinda obvious but when I was searching he signed a lot of his sketches with his full name and they didn't quite looks like that one.
So I was thrown a little.
Thanks for the links @tak35bne woll come in handy in the future.