Recently, someone analyzed computer science professors at top universities and found that over half of the professors at the top 51 universities graduated from a top 10 university. Others have also brought this up. From my personal observations, most schools do hire graduates from better ranked schools.
- Is this because of the competitive job market? We have so many good applicants, we have to narrow it down some how!
- Or is it simply that these schools produce the most PhDs?
- Has this always been the case?
- How rare are exceptions to this? I know of a few people who graduated from a top 75 school and got hired at a top 50 school. But what about bigger gaps? The top 10 schools seem to just swap graduates, do they ever hire from a 50+ ranked school?
This may or may not generalize to other fields and countries.