Yahoo development chief said to leave company to join Square

San Francisco

ONE of the top lieutenants in Silicon Valley is leaving the side of one high-profile Internet executive in Marissa Mayer to join another, Jack Dorsey.

Jacqueline Reses is departing Yahoo! Inc, where she had been chief development officer, to join Mr Dorsey's Square Inc, helping boost the startup's executive team while dealing a blow to the Web portal, according to people familiar with the matter, who asked not to be identified as the matter is private.