Peter Gleick, a scientist who masqueraded as a climate-change skeptic to gain access to and release a conservative group’s financial data, has been reinstated as president of the environmental think tank he founded, says The New York Times.

The Pacific Institute said its internal investigation confirmed Dr. Gleick’s account of his infiltration of the Heartland Institute, an organization that disputes that global warming is occurring, and that no other employees of the green group were involved. The Pacific Institute said its board of directors, which had condemned the subterfuge, has accepted Dr. Gleick’s apology.

Posing as a Heartland Institute board member, Dr. Gleick secured internal documents earlier this year with confidential details about the organization’s budget, strategy, and donors. The institute also accused him of circulating a fake document outlining a supposed plan by the group to sway science teachers, an allegation he denied.