Stella Zawistowski is a crossword constructor whose puzzles have appeared in the New York Times, the Los Angeles Times, TheWall Street Journal, and other venues. She is the author of Tough As Nails Crosswords, a collection of 72 extra-hard puzzles. Also a top-ranked speed solver at the American Crossword Puzzle Tournament, she has a personal-best time of four minutes, 31 seconds on the New York Times Sunday crossword.