Jill Greenberg is one of the most prolific, skilled, and untouchable contemporary photographers. She made an interesting, yet smart choice to move her portfolio website to Tumblr, allowing her many fans to engage with her and share her photos in an easy, stylish format. Chances are, you've seen a lot of her work on magazine covers, billboards, and otherwise, plus she shot our Jamie Chung cover for December 2010/January 2011. [JillGreenberg.com]