Personnel: Jeff Dean at Google DeepMind (Chief Scientist (Google Research / DeepMind))

NoteThe source directly confirms all key fields of the record: (1) Person: Jeff Dean ✓; (2) Organization: Google DeepMind ✓ (formed April 2023 from merger); (3) Role: Chief Scientist ✓ (explicitly stated: 'Dean became Google's chief scientist'); (4) Start date: April 2023 ✓ (source states 'In April 2023' for the reorganization and Dean's appointment). The source also earlier states 'He was appointed Google's chief scientist in 2023 after the merger of DeepMind and Google Brain into Google DeepMind.' All record fields are directly supported by the source text.