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 of Google Brain and DeepMind), (3) Role: Chief Scientist ✓ (explicitly stated: 'Dean became Google's chief scientist'), (4) Start Date: April 2023 ✓ (matches the claimed 2023-04). The Wikipedia article also states earlier: '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.