Gilles Clement is a horticultural engineer, landscape architect, and lecturer at the Ecole Nationale Superieure de Paysage at Versailles. He has written many books and essays on the philosophy, ecology, and practice of landscape design. Sandra Morris is an independent scholar and translator based in Shropshire, UK. Gilles A. Tiberghien is Professor at Universite Paris 1 Pantheon-Sorbonne and author of many books on art and landscape design.