Greenfields was founded in 1981 and in 1983 moved to its present location. At that time, the Greenfields Educational Trust, a registered charity, was set up to manage the school.

Greenfields is a private, independent school, which accepts and welcomes children from all over the world and employs staff of all races, religious denominations and creeds.

In 2000, the Trust set up the Greenfields HELP Centre in East Grinstead as a community service, a tutoring and literacy programme for children and adults in the local area delivered free of charge. HELP stands for Hollywood (where the Project was started) Education and Literacy Project and is funded by the Trust and by donations.

The Trust also owns and manages the Children's House nursery in East Grinstead, and frequently hosts foreign dignitaries interested in learning more about our unique study methods.

As well as these, the Trust has set up the Effective Education Centre and English Language College in the town centre to offer individual tutoring and courses based on the school's study methods to a wider public.