Chaim (Halevi) Soloveitchik, a method of highly exacting and analytical Talmudical study that focuses on precise definition/s and categorization/s of Jewish law as commanded in the Torah with particular emphasis on the legal writings of Maimonides. His primary work was "Chiddushei Rabbeinu Chaim", a volume of insights on Maimonides' Mishnah Torah which often would suggest novel understandings of the Talmud as well. Wikipedia
The definitive Wikipedia entry for Chaim Soloveitchik. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Chaim_Soloveitchik