Brett Matthews
He was an assistant to Joss Whedon on television shows such as "Buffy the Vampire Slayer" , "Angel" and "Firefly" . 
<triplet> Buffy the Vampire Slayer <subj> Joss Whedon <obj> creator <triplet> Angel <subj> Joss Whedon <obj> cast member <triplet> Firefly <subj> Joss Whedon <obj> creator