Stanley Kubrick's 1st AC

Hey y'all,

I just got a job as a 1st AC on my friend's set, and in preparation for that, I've been asking around for advice. Recently, someone who I now can't get in contact with told me to look up how Stanley Kubrick essentially reinvented the role of 1st AC. I'm trying to find what he meant by that, but Google is not helping me much. Do any of you have helpful information about this, or at least some guidance on where to look? Thanks!