He's got big hands. He's tall. He bakes very impressive cake-related things. Oh, and he does the odd card trick too. It's Denis Behr!
As promised, the links to his crediting projects:
https://www.conjuringarchive.com
https://www.conjuringcredits.com/doku.php
and Herbert's fan page: 
https://www.facebook.com/herbertrubberband/