Evan Gregory is an Associate Agent at Ethan Ellenberg Literary Agency who is actively looking for clients. You can read his short bio on the agency website: http://www.ethanellenberg.com/
Writer's Digest has an interview with Evan Gregory on their website.
You can see some response time statistics for Evan on Querytracker.
Evan has a little used but interesting blog: http://flaubertpyramid.blogspot.com/ as well as a little used Facebook page. You can also read about Evan's work experience on Linkedin.
The place where you can learn the most from Evan Gregory is on twitter. He's funny and he talks a lot about queries: http://twitter.com/EvanJGregory
Before you submit to Ethan, be sure to go over the agency's very thorough submission guidelines. There are instructions on how to submit by both snail and email. The instructions do say, "if applicable" to include sample illustrations. They say they are open to all genres and no where does it say only author-illustrators so I take it that providing sample illos doesn't apply to non-illustrators. Also if you have read through the links you will see that Evan says he does consider picture books.
The Ethan Ellenberg Agency represents Candace Fleming and Marthe Jocelyn.
This post is part of the Monster List of Picture Book Agents. If you have any changes that you think should be made to this listing, please contact me or leave them in the comments. Thanks!