Landscape design recommendation for a slope?

We live in a San Rafael, CA, Eichler, and plan to re-landscape our backyard. The unique aspect of our backyard is that it is mostly a slope going up about 20 feet at a fairly steep angle. There is some flat area for grass, before the slope starts. If anyone can recommend a designer in this area, I'd appreciate it. Or if anyone can show us pictures of what they did with their slopes, that'd be nice. Appreciate any ideas. Send recommendations directly to: robert_j_suess AT hotmail DOT com

--Bob