Henri Picciotto, a native speaker of French, knows English well enough to be the coeditor of National Puzzlers’ League Cryptic Crosswords (Random House, 2005). As a mathematics educator, he has taught everything from counting to calculus and has written many books and articles. Visit his website, picciotto.org.

• September 2006: Thoughts on the Art and Technique of Crossing Words
  Georges Perec was a major literary figure, but it should not be forgotten that he was a serious cruciverbalist.