Former US Federal Reserve chairman Alan Greenspan has agreed to become an honorary adviser to the British Treasury, Chancellor of the Exchequer Gordon Brown said Wednesday in a statement carried by Deutsche Presse Agentur (dpa). The announcement came within hours of Greenspan, 79, ending his 19-year tenure as chairman of the US Federal Reserve. Brown, who has had a close professional relationship with Greenspan over the years, described the American as "the world's greatest economic leader of our generation." Brown said his new adviser would help the Treasury "develop its thinking in areas relating to global economic change." Greenspan's role at the Treasury in London would involve regular meetings and exchanges of papers - but no pay cheque, sources said. Brown said the appointment was "good news." Greenspan's advice relating to global economic change would be "much appreciated." Greenspan was given an honorary knighthood by Queen Elizabeth II in 2002. But as a non-British citizen, he cannot use the title in a public role. --SP 23 17 Local Time 20 17 GMT