What makes Ivy grads more successful?

@romanigypsyeyes: It really depends on the field, but the schools that are ranked highest in a field (and yep, they’re not going to be all Ivies) tend to dominate in tenure track placement:

https://www.insidehighered.com/news/2013/09/03/study-examines-trends-phd-programs-produce-political-science-professors