Apparently he had a preference for the Palo Alto Kodak Kodachrome lab - he would often take his (developing included) Kodachrome into my Dad's Customer service department at the North Vancouver Kodak Canada lab and have it forwarded to Palo Alto for processing. Which of course made no logical sense, because Palo Alto and North Vancouver had almost identical technical benchmarks for Kodachrome processing. My Dad just shrugged it off as typical photographer eccentricity. He did remember him though, and not just because of the volume of Kodachrome he shot.
Well actually... with Kodachrome more than any other, the quality of processing depended on the quality of the people doing it. As I understand, Kodachrome processing required an on-site chemist.
In '77 I had some K64 come back from the L.A. lab dirty- crud was stuck to some of the slides, embedded in the emulsion. That was the last straw. I had been less than fully happy with them for a while, seeing some greenish color casts in neutral areas, purple skies, fluorescing of reds, and pinholes. My processing had been going out through a local shop, as back then Kodak picked it up, which I trusted more than mailers because it was very unlikely to get lost. I was in Southern California, so all my film went to the L.A. lab.
After that I was thoroughly disgusted with Kodak processing, so for a time I sent everything through my local shop to an independent called Fox Photo, who I had tried and found excellent results with, cheaper than Kodak. Their cutting and mounting was not as consistent as Kodak, though.
I decided to buy Kodak mailers and send them off to all the U.S. labs the mailers listed, and look for differences between them. I found quickly that the Palo Alto lab was a cut above. Consistent color, with neutral whites and shadows. Not saying others were bad (except L.A., they were bad), but Palo Alto was best. So I standardized on sending my film there. The lab in (if memory serves) Fair Lawn, N.J. was to my eye equal or close to it, but I still considered Palo Alto the best, plus my film didn't have to travel as far.
When I read criticisms of Kodachrome by people who tried it and didn't like it, especially when they mention odd color or color casts, I always wonder if they got bad processing.