I'm at the University of Vermont-- my program doesn't have a specific autism track, but a couple professors (including the dean of our College) specialize in it. We don't have a CSD PhD, but there is a brand new interdisciplinary PhD program that includes CSD topics like autism-- not sure if this is quite what you're looking for, but might be worth checking out.
https://www.uvm.edu/cnhs/doctor_philosophy_human_functioning_and_rehabilitation_science
