|The late, great Wallace Berman|
It's notable, of course, that two of these key figures were women, especially given how macho the LA art world was in the first few postwar decades. (Ferus included.) Here is a page about a show at Crossroads School about woman gallerists in the '60s and '70s.
Some of these themes will be part of a West Hollywood branch of Pacific Standard Time called It All Started Here.