Steve Patterson, v.p. and credit derivatives trader at Dresdner Kleinwort Wasserstein in Tokyo, is relocating to the firm's New York office next month. "It's home," said Patterson, adding that he has been at Dresdner in Tokyo for three years. After his departure Asian credit trading will be handled out of London until a replacement is found. He declined to elaborate on the reasons for the move. Patterson reports to Matteo Mazzocchi, global head of credit derivatives and securitization in London. Mazzocchi did not return calls.