Andrew Kellner, head of interest-rate derivatives at Dresdner Kleinwort Wasserstein in Tokyo, has recently left the firm. Yukiko Omura, managing director and head of global debt-Japan, said Kellner left the firm for personal reasons and is now in Europe. She added that he might return to the industry in the future, possibly at the end of the summer. "We'd be glad to hire him back if an appropriate position is available," Omura added. A trader from Dresdner's Frankfurt office will be filling Kellner's shoes, she continued, declining to name the individual. Kellner could not be reached.