Michelle Tan has joined Wachovia Securities as a v.p. and collateralized debt obligation structurer. She most recently worked at Credit Suisse First Boston, where she was a v.p. prior to being laid off (BW, 12/1). Tan, who is based in New York, says she reports to Yu-Ming Wang, managing director and the newly appointed head of the CDO business at the bank. Tan specializes in repackaging, or CDOs backed by structured finance bonds. The position is a newly created one. At CSFB, she reported to Chris Ricciardi, managing director.