Martin Meyerson in 1965 became the first Jew to serve, albeit temporarily, as the leader of a major American research university. That year, Meyerson served as acting chancellor of the University of California, Berkeley, but was unable to obtain a permanent appointment as a result of a combination of tactical errors on his part and antisemitism on the UC Board of Regents. Meyerson served as the president of the University of Pennsylvania from 1970 to 1981. By 1986, a third of the presidents of the elite undergraduate final clubs at Harvard were Jewish. Rick Levin was president of Yale University from 1993 to 2013, Judith Rodin was president of the University of Pennsylvania from 1994 to 2004 (and is currently president of the Rockefeller Foundation), Paul Samuelson's nephew, Lawrence Summers, was president of Harvard University from 2001 until 2006, and Harold Shapiro was president of Princeton University from 1992 until 2000. American Jews at American higher education institutions Religion Jewishness in the United States is considered an ethnic identity as well as a religious one. See ethnoreligious group. Observances and engagement Jewish religious practice in America is quite varied. Among the 4.3 million American Jews described as "strongly connected" to Judaism, over 80% report some sort of active engagement with Judaism, ranging from attending at daily prayer services on one end of the spectrum, to as little as attending only Passover Seders or lighting Hanukkah candles on the other. A 2003 Harris Poll found that 16% of American Jews go to the synagogue at least once a month, 42% go less frequently but at least once a year, and 42% go less frequently than once a year. The survey found that of the 4.3 million strongly connected Jews, 46% belong to a synagogue. Among those households who belong to a synagogue, 38% are members of Reform synagogues, 33% Conservative, 22% Orthodox, 2% Reconstructionist, and 5% other types. Traditionally, Sephardi and Mizrahi Jews do not have different branches (Orthodox, Conservative, Reform, etc.) but usually remain observant and religious. The survey discovered that Jews in the Northeast and Midwest are generally more observant than Jews in the South or West. Reflecting a trend also observed among other religious groups, Jews in the Northwestern United States are typically the least observant. In recent years, there has been a noticeable trend of secular American Jews returning to a more observant, in most cases, Orthodox,