Google AI is undergoing significant personnel changes. Demis Hassabis, the head of Google DeepMind, has stepped down from his day-to-day management role and will now serve as chairman and chief scientist of Alphabet. Meanwhile, Google's chief scientist Jeff Dean is leaving to co-found a new company, Discovery Loop, with Sanjay Ghemawat and others, dedicated to leveraging AI to advance the fields of science and engineering.