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in no particular order.
to be guided in Yosemite, legally, you have to go through Yosemite Mountaineering school. (209) 372-8344.
however you've got these cats: http://www.symg.com/ for the surrounding area.
And you can always walk into Camp 4 campground and look at the bulletin board, or just suss out folks in the parking lot.
the Eastern Sierras provides a few options...
For international trips or anywhere in the US check out Alan Jolley, who TAUGHT nearly all the AMGA guides how to guide!
If you want Sierra granite around Lovers Leap and Calaveras Dome try MAS. HANS guides through these cats!
For fun in Patagonia you must check out Shipoopi!