Rob Eastaway is the puzzle advisor for New Scientist's puzzle column. He is the author of several bestselling books on everday maths, including Maths On The Back of an Envelope, Why do Buses Come in Threes? and Maths for Mums and Dads. He lives in London.
Brian Hobbs is the host of the acclaimed podcast Brain Drop Puzzles. His puzzles also appear frequently in New Scientist. He lives near Dallas, Texas.