The artist is Roger Hopkins, a stone sculptor in Desert Hot Springs, California. These can be found at the corner of Little Morongo Road and Dillon Road. If you want to see more of Roger's art and are interested in buying stuff...go to his page at www.rockartist.org.
This stuff is amazing! Couple this with the Simi Daba stuff that I love and you have desert art at it's finest. Of course, Bret Philpot has all the best stuff for your inside walls too. Lilly Tomlin knows how to get ahold of his artwork. LOL