Ryan Glitter is a concept artist who’s worked for the likes of Privateer Press, Crytek and Sony Online Entertainment. He’s drawn for historical, sci-fi, fantasy and steampunk and in these samples of his work you might well conjure up images of Halo 4, Planetside, Starhawk and perhaps a little Warmachine action too.
You can check out more of his work on his portfolio site and blog. It gets even better as Ryan has a Society6 store if you want to buy his prints and a Patreon page with generous .PSD file sharing options.