Ivy League have produced many Nobel laureates, winners of the Nobel Prize and the Nobel Memorial Prize in Economic Sciences. According to the Nobel Foundation's website, the number of prize-winners affiliated with each Ivy League university at the time of their awards is: Brown, 2; Columbia, 17; Cornell, 8; Dartmouth, 0; Harvard, 36; Penn, 4; Princeton, 14; and Yale, 8. In addition, each university self-reports their number of affiliated Nobel laureates, but they use varying definitions for which Nobel winners they claim (for example, alumni, active faculty, former faculty, visiting faculty, adjunct faculty, etc.) Collaboration between the member schools is illustrated by
Black Ivy League Greenstone, found that between the 1970s and the 1990s, "there is a wage penalty" in attending a HBCU over those attending historically white colleges, "resulting in a 20% decline in the relative wages of HBCU graduates between the two decades." Unlike the Ivy League, the main focus of the Black Ivy League has been on undergraduate education. However, Howard University has several graduate-level professional programs, including a medical school, and Morehouse at one time had a medical school, which has since become independent. There are two other historically black medical schools not affiliated with Black Ivy League-identified colleges, located in