He was the first to uncover and detail the role of the billionaire Koch brothers in financing the Tea Party movement. His interviews and research on the Koch brothers have been featured on HBO’s “The Newsroom,” the documentaries “Merchants of Doubt” and “Citizen Koch,” as well as in multiple media outlets. He was an investigative blogger for ThinkProgress(2009-2011) and then a fellow at the Investigative Fund of the Nation Institute and contributing writer for The Nation.