Gradually Weizmann set up a separate following from Moses Gaster and L.J. Greenberg in London. Manchester became an important Zionist center in Britain. Weizmann was mentor to Harry Sacher, Israel Sieff and Simon Marks (founders of Marks & Spencer), and formed a friendship with Asher Ginzberg, a writer who pushed for Zionist inclusivity and urged against "repressive cruelty" to the Arabs. He regularly traveled by train to London to discuss spiritual and cultural Zionism with Ginzberg, whose pen name was Ahad Ha'am. He stayed at Ginzberg's home in Hampstead, whence he lobbied Whitehall, beyond his job as Director of the Admiralty for Manchester.