Jay Conrad Levinson is the author of more than a dozen books in the Guerrilla Marketing series. A former vice president and creative director at J. Walter Thompson Advertising and Leo Burnett Advertising, he is the chairman of Guerrilla Marketing International, a consulting firm serving large and small businesses worldwide.

Ed Lewis is an experienced and well-known mathematics education author and consultant who teaches at Australian Catholic University. He is an advocate of quality maths programmes that provide practical, stimulating and thought-provoking activities for children and has written many titles and series that support teachers in realizing this mission.