Hi Jon's mom,
Here are the resources from Hoagiesgifted.org at
http://www.hoagiesgifted.org/psychologists.htm#ucaCalifornia
Barbara Klein, Ph.D., Los Angeles
phone: (310) 209-0515. e-mail: barbarak360@aol.com
Carolyn Light, Ph.D., R.N., San Diego
phone: (619) 981-9366. e-mail: carolynlight@san.rr.com
Esther Sinclair, Ph.D., UCLA
also experience with twice exceptional children; phone: (310) 825-0075. e-mail: esinclair@mednet
I don't know any of these folks personally, but I have read lots from Dr. Sinclair, and would probably start with her, or someone from her group.
Trinity