Born in 1900 Geoffery Jellicoe's working life covered a long period from 1925 until his death in 1996. During this time there was a great change in landscape architecture in terms of techniques, professionalism and philosophy. Geoffery Jellicoe was at the forefront of all these changes.

His work can be split into three periods,.-

1. Early Work (1927-60)

His first work with J.C. Shepard was the book "Italian Gardens of the Renaissance" published in 1925. This was researched with great care, and was one of his earliest influences in designs such as the Royal Lodge at Windsor Great Park in 1936.As a lecturer he also came into contact with the Modern Movement of the time. Influences such as the architect Le Corbusier, the painter Picasso and the sculptor Henry Moore encouraged a different approach. It was during this period of his life he married. Susan Jellicoe became a respected plantswomen and was responsible for this element in many of her husbands projects as Geoffory Jellicoe was not an expert in this area. He also became involved in some long term projects, one for Blue Circle Cement was to cover 50 years.

2. Second Period (1960-80)

In his early work Geoffery Jellicoe largely worked in partnership with other designers. During his second period he struck out alone, although backed up with an office and staff. This freedom from partnerships lead to the development of a distinctive style. This can be seen in The Rose Garden at Cliveden where the artist Paul Klee has influenced a design of great movement. In Geoffery Jellicoe's design for The Kennedy Memorial at Runnymede a philosophical approach shows the influences of John Bunyan's "Pigrims Progress".

3. Master Period (1980-96)

In the final period of his life Geoffery Jellicoe shed his large office and concentrated on a few large projects. An example of this is 'The Moody Gardens in Texas' which is a personnel interpretation of the history of gardens and landscapes of the world.

During his working life Geoffery Jellicoe worked on many large and important projects, some over many years. He produced many prototypes for new landscape design, from quarries to roof gardens. He was also a founder of the International Federation of Landscape Architects and worked on other professional bodies.He was not a plantsman, although he knew something about trees, and he left us no great works on colour or plants themselves. He had many influences from the Italian Renaissance through Modern artists to Chinese and Classical philosophy. He can be placed as the product of an English tradition but his influences were much wider. His message that buildings should not be placed to dominate a landscape but rather the landscape should be the predominate factor is one which can be applied universally.