Alphabet shares fall after the company announces that Jeff Dean, Google’s chief scientist and a long-time executive, plans to leave. Multiple outlets report that Dean is a key figure in the company’s artificial intelligence efforts and has been among its earliest employees. MarketWatch and NDTV both link the sharp decline in Alphabet’s stock to the announcement of his planned departure. NDTV says the shares drop by about 5%, framing the move as a response to Dean’s exit plan, while MarketWatch highlights that Dean is leaving to start his own company. Both articles treat the development as material to investor expectations about Google’s leadership in AI and Alphabet’s future strategy. The reporting centers on Dean’s role as chief scientist and the company’s communication that he is departing, without detailing additional corporate leadership changes or new interim arrangements. Overall, the coverage aligns on the timeline and the market reaction, emphasizing Dean’s importance within Google’s AI organization and the decision to pursue a new venture.