The $C64.4 billion (US$49.4 billion) Canada Pension Plan Investment Board, Toronto, is searching for a vice president-private market investments to replace Mark Weisdorf, who resigned effective today. Ian Dale, spokesman for the CPPIB, cited "differences in management philosophy" as the reason for Mr. Weisdorf's departure. Mr. Dale emphasized the departure was not related to strategy or investment performance of the fund's private equity investments. No timetable has been established for filling the vacancy. Mr. Weisdorf could not be reached for comment.