Here's how Rav Schwartz answered him:
As of now I do not know one who has the comprehensive understanding on how to guide you, but I can give you some examples of names of people today who each are experts at the areas of Torah they are known in.
An expert on any of the words of the Gra is, Rav Dovid Cohen from Chevron.
An expert on the path of Ramchal [Rav Moshe Chaim Luzatto, Way of Hashem, Mesillat Yesharim, etc.] is, Rav Mordechai Shirki, who heads Machon Ramchal.
An expert on Reb Yisrael Salanter’s methods is, Reb Uri Weisblum.
An expert on Maharal is Rav Yehoshua Hartman, who prints Maharal sefarim and who heads Machon YaM, and above him is Rav Yonasan David, the Rosh Yeshiva of Pachad Yitzchok.
An expert at the school of thought Kelm and Slabodka is, Rav Reuven Leuchter.
Concerning the approach of Novhardok — find out from his talmidim in France about who the expert on Novhardok is today, because I do not know about it.
An expert on Chabad Chassidus is, Rav Yitzchok Ginzberg and Rav Yoel Kah, z"l.
An expert on Breslev Chassidus is Rav Kluger from Beit Shemesh.
An expert on Chassidus in general is Rav Yaakov Moshe Erlanger.
An expert on Kaballah is Rav Yitzchok Meir Morgenstern.