Scientist Michael Mann, whose work on climate change led to contentious litigation over access to his emails, filed a libel lawsuit Monday against National Review, accusing the conservative publication of defaming him by accusing him of academic fraud.

In the complaint filed in District of Columbia Superior Court, Mann, director of the Earth System Science Center at Pennsylvania State University, claimed that a July 15 article not only falsely accused him of misconduct but crossed a line by comparing him to Jerry Sandusky, the former Penn State football assistant coach convicted of child molestation. He also sued the Competitive Enterprise Institute, a think tank that ran a piece about Mann on its staff blog, OpenMarket.org.