Editas Medicine, Inc. appointed James Mullen as board chairman, effective March 28.
Mullen previously served as CEO of Patheon NV until the company's acquisition by Thermo Fisher Scientific Inc.
In addition, the Cambridge, Mass.-based biotechnology company said its co-founder Alexis Borisy and John Mendlein stepped down from the company's board.
Borisy joined the board in 2013. Mendlein, who is Moderna Therapeutics Inc.'s president of corporate and product strategy, joined Editas' board in 2016.