| F2. c. Faculty by Source of Graduate Training/PhD, 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% | |