Robinson joined the practice, which counts The Royal Parks, The National Trust, Natural England and Savills among its clients, in 2010 as a senior landscape architect.
He said: "After nearly seven years with the practice I am very excited by the challenge ahead and proud to have been appointed to take The Landscape Agency forward. I hope to build on our strong past and continue the success achieved by the team over the years in this new chapter of The Landscape Agency’s history.
"As a landscape architect, I’m passionate that landscape solutions of any scale should be based on an understanding of the context to ensure the next phase builds and adds to the sense of place. I feel the landscape is much more than simply ‘space’; it is an exciting dimension where through considered and collaborative design we can excite, engage and above all, create places for people to enjoy."
The Landscape Agency was established in 1998 by Patrick James, who will continue to be a company director but will no longer be involved in running the business. He said Robinson was "an excellent and very experienced landscape architect."
The Landscape Agency is a long-term collaborator of Sheffield University professor of planting design and vegetation technology Nigel Dunnett, working with him on a new masterplan for RHS Garden Harlow Carr in Harrogate, North Yorkshire. They also worked together on the new gardens at The Barbican Centre, London, a garden for the RHS's Greening Grey Britain campaign at Hampton Court Flower Show in 2015 and a rain garden at John Lewis' London headquarters.