Clancy Brown played Kelvin Inman.
I have written to him, requesting an autograph.
I'll update this post if/when I receive a response.
My collection includes
Rittenhouse LOST Archives Character card #27
A small image of Kelvin rescuing Desmond
can be found on Tyler Stout's "LOST".
UPDATE: Autograph Obtained!
I briefly met Clancy Brown at the
"Cowboys and Aliens" World Premiere during Comic-Con
and was able to get his autograph.