Chances are that you’ve heard of Valerie Coit. A competitive puzzler since 1999, she is a member of the iconic puzzling team Wicker Kittens (and a standout personality in the movie of the same name), was a founding member of the USA JPA, and is currently Vice President of the World Jigsaw Puzzle Federation.
And if none of that seems familiar, she announces the live streams at both the US Nationals and Worlds competitions.