Moody's Investors Service is adding two managing director slots to its collateralized debt obligation staff, as part of its intention to dedicate additional resources to the market. Gary Witt and Yuri Yoshizawa have been named managing directors, up from v.p./senior credit officers. The promotions bring to five the number of managing directors at Moody's focusing on rating CDOs and derivatives, according to Lisa Tibbitts, a Moody's spokeswoman. The other three are Jerry Gluck, Bill May and Gus Harris. The managing directors all report to Noel Kirnon, group managing director. Tibbitts says the rating agency has not yet decided how the managing directors will split up coverage lines.