Google's top executive for its core search and advertising units, Sridhar Ramaswamy, is departing for VC firm Greylock. : Google advertising and search chief Sridhar Ramaswamy is joining Greylock.Greylock / Sridhar Ramaswamy One of Google’s most important executives managing its core advertising and search businesses is leaving the Googleplex for a new career in venture capital. Greylock Partners announced on Monday that Sridhar Ramaswamy is joining the Silicon Valley VC firm as a venture partner.