Dec 6 (Reuters) - Activist investor Engine Capital on Wednesday urged 2seventy bio to appoint its current finance chief Chip Baird as the company's chief executive officer, in a letter sent to the cell and gene therapy developer's board.

Engine Capital owns about a 3% stake in 2seventy bio. (Reporting by Bhanvi Satija in Bengaluru; Editing by Krishna Chandra Eluri)