saddle
verb
noun
□ in the saddle
the president is firmly in the saddle:
in charge, in command, in control, responsible, at the top, in authority, in the seat of authority, at the wheel, in the driving seat, at the helm;
managing, running, administering, directing, supervising, overseeing, controlling, commanding, leading, heading up;
informal holding the reins, running the show, pulling the strings, calling the shots.