GlaxoSmithKline's ($GSK) new chairman will take over several months earlier than expected. When Glaxo tapped Sir Philip Hampton, now chair of Royal Bank of Scotland, to lead its board last fall, his target start date was September of this year. But now, the drugmaker says Hampton is free to take the reins in May. Hampton replaces Christopher Gent, who's been chairman since 2005, at a time when GSK is under pressure from investors to step up its performance. Report