A Credit Suisse executive in charge of advising private equity firms on their fundraising and secondary-market deals has left, the latest in a series of high-level exits since the investment bank’s acquisition by Swiss rival UBS last year.

David Klein, who led Credit Suisse’s global private fund group out of New York, left in recent months after nearly 21 years with the Zurich-headquartered investment bank, according to several people familiar with the matter.