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, cryptic crosswords for Canada's National Post, puzzles for the US Airways in-flight magazine, Attache, and (with Henry Hook) Sunday crosswords for the Boston Globe.
In 2005, Rathvon's play Trapezium, a comedy in iambic pentameter, was produced by the Orlando-UCF Shakespeare Festival.
Rathvon is a member of the National Puzzlers' League under the nom Hex.