Demis Hassabis stepped down as chief executive of Google DeepMind and became chair of DeepMind and chief scientist of Alphabet

Created in 2015 as a holding-company restructuring of Google, separating the core search and advertising business from more speculative ventures such as Waymo self-driving cars and Verily life sciences. Sergey Brin and Larry Page controlled it through super-voting shares for years after stepping back from daily management.