首席

chief (representative, correspondent etc)

head / chief / first (occasion, thing etc) / classifier for poems, songs etc

surname Xi

woven mat / seat / banquet / place in a democratic assembly / classifier for banquets, conversations etc

variant of 席[xi2] / woven mat

chief representative

chief information officer (CIO)

chief executive officer (CEO)

Chief Justice (of US Supreme Court)

chief technology officer (CTO)

Chief Justice

chief marketing officer (CMO)

chief financial officer (CFO)

chief operating officer (COO)