Joonkee Hong, UBS Warburg's mild mannered co-head of DCM is leaving Asia to become the bank's global head of emerging markets derivatives marketing. It has been a rapid ascent for the native Korean, who joined the bank in 1995 to run the rates group in Seoul, before transferring to Hong Kong after the Asian crisis to run the derivatives side of the debt business alongside co-head Paddy O'Brien, who oversees the primary bond business.