Lipman and Sharp
Philosophy for Children (P4C) as a method of enquiry, was developed by Matthew Lipman and Ann Margaret Sharp in the late 1960's. They both still work at the Institute for the Advancement of Philosophy for Children at Montclair State University in America.

Lipman and Sharp developed specially written texts to be used in the classroom.

Karin Murris
A Dutch philosopher, counsellor and educator, Karin Murris, trained with Lipman and developed the method by the use of picture books.

Murris believes that there is a wealth of good quality picture books in every classroom and these have the Philosophical dimension necessary for dialogue. She published Teaching Philosophy with Picture Books. Karin also uses a whole range of stimuli including music, objects and pictures.

Karin Murris and a fellow Philosopher and educator Roger Sutcliffe have a company called Dialogueworks and have published Storywise: Thinking through Stories and Newswise: Thinking through the News.

Maria Cornish and Sara Stanley
The approach that Sara and Maria use is based on the training they have received from Karin, Roger and Joanna Haynes at Dialogueworks.