Charles Adams is Fellow of the Chartered Institute of Horticulture, formerly Vice-Principal of Capel Manor College and Head of the Science Department at Oaklands College. He is an examination moderator of horticulture examinations and a member of the Royal Horticultural Society Qualifications Advisory Group.

Jane Brook is a freelance lecturer in plant science and horticulture, formerly at Capel Manor College, Middlesex University and the University of Hertfordshire, UK, and is also an examiner in horticulture at the Royal Horticultural Society, UK.

David Francis is a professional associate of the Royal Horticultural Society and lives in Japan. He was formerly a lecturer in horticulture at Capel Manor College in London.

Mike Early was a lecturer in horticulture science at Oaklands College, UK, and a landscape gardener.