The two sharers who would contribute the most to the Chamberlain's Men did not come from Strange's Men. Shakespeare's activities before 1594 have been a matter of considerable inquiry; he may have been with Pembroke's Men and Derby's Men in the early 1590s. As a sharer, he was at first equally important as actor and playwright. At an uncertain but probably early date, his writing became more important, although he continued to act at least until 1603, when he performed in Ben Jonson's "Sejanus".