American International Group Inc., the insurer that’s been slashing jobs to cut costs, dismissed four senior members of its real estate business including the group’s chief executive officer, Robert Gifford, according to a person familiar with the move.

AIG Global Real Estate’s head of Americas, Donald Huffner, and Brooks Mohrman, who managed investments in Mexico, were also let go as part of a plan to cut more than 300 senior positions, said the person, who asked not to be named discussing personnel matters. The group’s general counsel, Richard D’Alessandri, was also dismissed, the person said.