The Vermont-based frozen dairy dessert maker, sold on some college campuses, called for a permanent ceasefire in Gaza in January.
Ben & Jerry’s joins a list of organizations and government bodies calling for a ceasefire in the war.
Unilever did not mislead investors by not disclosing Ben & Jerry's decision to boycott the West Bank, a Manhattan federal court said.
Schumacher, 51, joined Unilever in October last year as a non-executive director.