Jeff Dean's Final 48 Hours at Google: 1,500 Colleagues Bid Farewell, He Replies to Messages Until 2:30 AM

Jeff Dean, a legendary Google engineer, disclosed his final 48 hours at the company during his talk at KDD 2026. On Wednesday morning, he announced his departure to 139 close colleagues via video call, then sent a farewell email to all employees and publicly announced his new venture, Discovery Loop, co-founded with Sanjay Ghemawat, Oriol Vinyals, and Quoc Le. In the afternoon, about 1,500 colleagues gathered at a Google cafe, far exceeding its 300-person capacity, to bid him farewell. Despite the emotional day, Dean attended yoga and a football match in the evening. Late that night, he found 400 internal messages awaiting him, which would vanish when his account access ended, so he replied to all of them by 2:30 AM. The next morning, more messages arrived, and he continued replying until he had to return his Chromebook and badge at 5:20 PM. At 11:59:59 PM, he jotted down 'Unemployed' in his schedule, but one second later, he became the co-founder and CEO of Discovery Loop. The outpouring of support reflected his impact: Dean joined Google in 1999 as its 30th employee, contributed to MapReduce, Bigtable, Google Brain, TensorFlow, TPU, and Gemini, and led teams of up to 4,400 people. His departure even led to a GoFundMe joke from colleagues. The next day, he toured six office spaces in 80 minutes for his new company, showing he was already moving forward.