Synonyms for Leading light:

n.

authority figure, prime mover, mogul, magnate, mover and shaker, eminence, figure, a force to be reckoned with, vip. inspirational celebrity (noun)
luminary.
leading light (noun)
notability, guiding light, notable, luminary.

Other synonyms:

mover and shaker, prime mover, authority figure. mogul, eminence. figure. Other relevant words:
vip.