It is Shepard Fairey.

An identifying force during this past presidential election was Shepard Fairey's depiction of Obama on a selection of posters. The most recognizable was that of "HOPE" in the exact same style as the poster in discussion. This simple design quickly became iconic and has since taken off for other campaigns such as adoptapet.com. The redesigned poster featuring a dog and the word "ADOPT" along the bottom is clean, familiar and highly informative without the use of much text. While this design could probably be characterized by any color scheme, using the same theme of red and blue on white/cream reinforces the artist's performance and hopefully creates the same impact upon the audience. This design is so powerful because of it's simple and precise message delivered flawlessly in a 2-d manner. The text along the bottom is almost authoritative and provides a stark message coupled with the softness of the image of the dog. The colors are used in a way that keeps your eye moving and even breaks up the background to allow some depth between the subject and the rest of the space. This evenly spaced, centered image reinforces the sensation that the text provides: strong impact, clear-cut and precise. I fully support this ad and it's message and although I may be biased towards it's cause, the overall impact is essentially achieved as a reworked design.