The Hybridiser you are looking for is Opal Brown,Oregon.
First registered Iris in the 1950's. The registration of Full Tide copied below should give you another search hint

FULL TIDE (Opal Brown, R. 1972). Sdlg. 9-14E16. TB 38" (97 cm) EM. S. wisteria blue (RHS 93D); F. blue (92A); light yellow beard brushed blue; ruffled. Babbling Brook X 3-12C1: ((Lipstick x Country Cuzzin) x Bright Cloud)., Brown's Sunnyhill Gardens 1972.

You can sometimes see a local hybridizer mentioned at the region sites listed at AIS.

I don't know of a list. Good idea to start one.

Here is a link that might be useful: http://www.irises.org/ais600localiris.htm

Oh thanks! Actually, I have found a lot of the other hybridizers for my list from links to area newsletters that mention what the locals are up to. Once in a while they have won an award, and then they have web presence because of that. I have been pretty lucky at figuring out the where for most everyone whose iris I have except for Ms. Brown. Now my list is more complete.