Credit Suisse First Boston has recently lost Greg Park, director and Asian head of asset-backed securities in Hong Kong. Market officials said Park, who handled both ABS and collateralized debt obligations, is believed to be taking time out of the industry. Jon Pratt, head of debt capital markets for non-Japan Asia in Hong Kong, has assumed direct responsibility for the ABS unit. Pratt was traveling and Park could not be reached. Josephine Lee, spokeswoman in Hong Kong, declined comment.