Once Zacharias Frankel and other historically-minded scholars had affirmed that Judaism has always been changing, a question presented itself: How does Judaism change? Frankel and Solomon Schechter, then a lecturer at Cambridge University, both saw the authority for change as rooted in the Jewish People—but which of the people?

Further reading:
Zachariah Frankel in Mendes-Flohr and Reinharz, The Jew in the Modern World (2nd ed., 1995), 194-197, 178-182
Solomon Schechter, “Historical Judaism,” “Excerpts from Seminary Addresses,” and “The Work of Heaven,” in Waxman, Tradition and Change (89-109, 163-172)