a leading light

leading light

A person who is well-respected and viewed as important to a group. As a leading light of the human rights organization, he helped improve working conditions for millions of people around the world.
See also: leading, light

a leading light

mainly BRITISH
COMMON If someone is a leading light of an organization or group, they are one of the most important, active, and successful people in it. He is a leading light in the campaign to rid football of racism. She had been a leading light in the amateur dramatic society in Kuala Lumpur. Note: A leading light was a light which was placed at the entrance to a harbour or shallow channel of water, as a guide for ships.
See also: leading, light

a ˌleading ˈlight (in/of something)

an important and respected member of a group, an organization, a profession, etc: Mr Harris is a leading light in the local business community.
See also: leading, light