Faculty by PhD Source,  by Appointment Era
Era Columbia Other Ivy Sister US Private US Public Foreign Unknown/None
1889-1914 11% 18% 8% 18% 18% 16% 105
1915-1939 18% 12% 10% 8% 13% 17% 22%
1940-1964 14% 14% 14% 12% 17% 20% 9%
1965-1989 10% 6% 7% 15% 27% 23% 14%
1990-2018 5% 3% 3% 16% 29% 20% 24%
1975 145 49% 19% 4% 8% 10% 8% 5%