Rabbi Joseph Ber Soloveitchik thought is greatly indebted to Kantian philosophy. In contenting himself with the philosophical world of Kant, JBS shows himself to be thoroughly unmodern in his philosophical approach to halacha.
Rav Soloveitchik himself was a traditionalist, who combined that ideology with religious Zionism and tried very hard to give it a place in the world of philosophy and modernity. He was unable to overcome the enormous tension between these two worlds and so became a “lonely man of faith,” with no disciples but with many students, each one of whom claimed their own Rav Soloveitchik. The truth is that the real Rav Soloveitchik was more than the sum total of all of them – a man of supreme greatness who was a tragic figure.