High Quality Content by WIKIPEDIA articles! Robert C. Gilman is a thinker on sustainability who, along with his late wife Diane Gilman, has researched and written about ecovillages. The Gilmans’ work was important in giving definition to the ecovillage movement and shaping the direction of the Global Ecovillage Network. In 1991, the Gilmans co-authored Eco-Villages and Sustainable Communities, a seminal study of ecovillages for Gaia Trust.