From Nate Hallinan‘s official website:
I’m a Concept Artist who has worked in film, commercials, video games and a variety of other media. I began my career in 2007 and never looked back. I primarily do concept art, having held both lead and senior positions, but I also provide key art, matte painting and art direction services. I have experience working in-house for several game and commercial studios, but I currently and keep busy as a contract/freelance artist.
See more artwork here: http://natehallinan.com/