Definition of "popularizer"

When a female friend of mine questioned Robert Wright, the author of The Moral Animal and one of the prime popularisers of this position, about some of his unshakable convictions in the male-female contrariety, he opened his eyes wide, stared at her, and said, manfully, "You don’t know what it’s like."

1999 March 20, Natalie Angiers, The Guardian