chief information officer, CIO

chief technical officer, chief technology officer, CTO

chief operating officer, COO

chief financial officer

a chief executive officer

person

a person in charge; a person responsible

to be active (in), to participate actively (in)

active participation / being active / being energetic / being lively / being thriving / being successful / flourishing / making a big contribution / playing an active role / making a great achievement / contributing greatly / being productive

(archaic, now literary) my / (archaic, now literary) our