at the helm
In charge, in command, as in With Charles at the helm, the company is bound to prosper. This phrase transfers the idea of steering a ship to directing other enterprises. [Early 1500s] Also see the synonym at the wheel.
Related Words for at the helm guilty, answerable, important, liable, culpable, subject, authoritative, bonded, bound, censurable, chargeable, engaged, executive, exposed, held, high, incumbent, obligated, obliged, open