Maulfry Worthington and Elizabeth Carruthers are founders of the international Children's Mathematics Network, established in 2003. They have both taught in the full 3-8 year age range for over 26 years and have carried out extensive research in key aspects of early mathematics, with a particular focus on the development and pedagogy of children's early written mathematics (children's mathematical graphics). They are winners of several national awards for their work with children and teachers on children's mathematical graphics.