turns out he has a doppelganger
French actor, stuntman and the inventor of parkour, David Belle: http://www.imdb.com/name/nm1042642/
Photos: http://content6.flixster.com/photo/41/41/69/4141696_tml.jpg
http://www.straighttothebar.com/images/posts/070406_davidbelle.jpg
http://cine.woopic.com/photos_grand/92/86/david-belle,349788.jpg
I just watched District B13 and the resemblance is so uncanny, down to their facial expressions and all, that it bothered me throughout the entire movie, since obviously I can't see Josh Radnor as an action hero.