"The Jewish Telegraphic Agency, a Jewish news wire service, reported in 1967 that Jewish students had reached high numbers at the Ivies after decades of low enrollments. The news outlet cited a New York Times survey at the time, which found that the student bodies at Columbia University and University of Pennsylvania were 40 percent Jewish."
https://www.insidehighered.com/news/admissions/2023/05/08/jewish-student-enrollment-down-many-ivies