Greg is working to define and study “social-psychological ecosystem services” by developing methodologies to study links between experience in wilderness and human well-being - measuring nature's impacts on mental health for individuals, and value systems in communities. He is exploring approaches for evaluating the social and psychological impacts of nature, and how these can best be incorporated into the paradigm of ecosystem services. He is also examining ways in which environmental history and sense of place might play a role in determining what the benefits are from this type of service. Greg is particularly interested in the repercussions of urban sprawl in California.