According to New York Attorney General Eric Schneiderman, Rex Tillerson used an email alias of "Wayne Tracker" to communicate with other Exxon executives about climate change while serving as CEO of Exxon Mobil. "New York Attorney General Eric Schneiderman has been leading an investigation of Exxon Mobil centered on whether the company misled investors by publicly arguing against the reality of climate change even though its executives knew the science was accurate," reports Ars Technica. "The investigation was triggered by news reports describing climate research the company undertook in the 1970s and 1980s, which affirmed the work of other climate scientists and showed that greenhouse gas emissions were causing climate change. Exxon buried that work and spent the next couple decades claiming that the science was unclear, although it has recently publicly acknowledged reality." From the report: The e-mails that were provided allowed the attorney general to figure out that Tillerson used the account between 2008 and 2015 at least, but it didn't appear on Exxon's list of accounts for which records were preserved. The letter also mentions 34 other e-mail accounts "specifically assigned to top executives, board members, or assistants" that the attorney general thinks should have been included. In a statement, an Exxon spokesperson explained, "The e-mail address, Wayne.Tracker@exxonmobil.com, is part of the company's e-mail system and was put in place for secure and expedited communications between select senior company officials and the former chairman for a broad range of business-related topics." The Office of the Attorney General's letter claims that "Exxon has continuously delayed and obstructed the production of documents from its top executives and board members, which are crucial to OAG's investigation into Exxon's touted risk-management practices regarding climate change."