John Heller will join federal contractor Amentum Services Inc. as CEO, effective March 28, says the firm. In that role, he succeeds John Vollmer, who had held it since the firm’s 2020 spinoff from AECOM as its former government services unit and the unit's acquisition for $2.4 billion by private equity firms. Vollmer, who had led the former AECOM unit for four years, becomes Amentum board chairman.
