Henry Rathvon is a puzzle writer. He and his partner, Emily Cox, write The Puzzler, a cryptic crossword featured each month in the magazine The Atlantic Monthly. They also create acrostic puzzles for the New York Times, Sunday crosswords for the Boston Globe, cryptic crosswords for Canada's National Post, and puzzles for the US Airways in-flight magazine, Attache.

In 2005, Rathvon's well-received play Trapezium, a comedy in iambic pentameter, was produced by the Orlando-UCF Shakespeare Festival.