Demis Hassabis, the Nobel laureate who transformed Google DeepMind into a global force in artificial intelligence, has relinquished the CEO role to become Alphabet's chief scientist — a quiet return to the laboratory after years spent navigating the demands of corporate leadership. The transition, more than a year in the making, reflects a tension as old as discovery itself: the pull between building institutions and doing the work that made those institutions worth building. In stepping back from consumer AI and the pressures of Gemini's development, Hassabis is wagering that his most meaning