As per R' Yitzhaks footnote, I created a wiki entry for him, Isaiah Berlin (Rabbi). I do not know of any full-length studies, hagiographical or otherwise on this fascinating figure. If anyone has info please comment.
See no. 2 of this post for a rather interesting comment of his. As I wrote then, I am [still] looking for a Kovetz Beis Halevi V. 3 which should contain R' Berlin's hagahot to Mitpachat Seforim. If anyone has seen this I would be interested to hear something of the nature of thes notes, as these should have important information concerning R' Berlin's Weltanschauung.