How possible is it to get a tenure track position at a top 30 or above university in physics? I know that getting any tenure-track position is hard in itself, but I'm also wondering about a specific rumor I heard a bunch of times that "you can only end up being a professor at a school lower than or equal to in rank to your grad school." I've found some cases where this isn't true in faculty lists, but even more where it does seem to be true... So does that mean, e.g., if I go to grad school in physics at a "top 10" I can kiss away any dreams of teaching at a "top 5?" Just wondering if anyone can debunk this... If not, why is this so?