Harvard, which topped every ranking from 2005 through 2009, dropped to No. 2 this year. QS ascribed this to a big drop in its student-faculty ratio and its hiring of international staff.
Rankings by category:
Academic peer review: 2 (2 in 2009)
Employer review: 1 (3 in 2009)
Citations per faculty: 3 (6 in 2009)
Student-faculty ratio: 40 (28 in 2009)
International faculty: Did not rank in top 100
International students: 70 (116 in 2009)