1. (a person whose actions and opinions strongly influence the course of events)
important person, influential person, personage
synonim: osobistość
synonim: figura
synonim: persona

2. (someone who is dazzlingly skilled in any field)
ace, adept, champion, sensation, maven, mavin, virtuoso, genius, hotshot, star, superstar, whiz, whizz, wizard, wiz: : synonim: as

ACE