Mark Johnson obtained his degree in Psychology from Edinburgh University and his PhD from the Zoology Department at Cambridge Development Unit, before recently taking up an appointment as Associate Professo of Psychology at Carnegie Mellon University. John Morton came to London in 1985 to head the new MRC Cognitive DEvelopment Unit. In addition to his work on infant face recognition, he also works on child witnesses and reading acquisition. He is also a regular contributor to All in the Mind on Radio 4.