Elizabeth Carruthers and Maulfry Worthington 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. They are winners of several national awards for their work with children and teachers on children's mathematical graphics.