Weyant is the director of the Energy Modeling Forum, an editor of Energy Economics, and a lead author of the IPCC (the work of the IPCC, including the contributions of many scientists, was recognised by the joint award of the 2007 Nobel Peace Prize). Weyant co-authored the book "Renewed Energy" with Ernestine Fu and Justin Bowersock. He is a key figure in the academic communities of energy economics, integrated assessment modelling, and climate economics, and has been influential in shaping the international policy debate on climate policy.