(AIG) - Get Report

executive has agreed to work with investigators probing the company's accounting and in return receive immunity from possible charges, according to a published report in

The Wall Street Journal


Joseph Umansky, the president of AIG Reinsurance Advisors, has agreed to cooperate with authorities, the


reported, citing people with knowledge of the matter. A representative of AIG told the


that Umansky still works at the company but wouldn't offer additional comment.

Some of the insurance company's reinsurance agreements are at the center of various governmental investigations into AIG.

Authorities expect Umansky to provide information on AIG's reinsurance agreements with General Re, part of

Berkshire Hathaway

(BRK.A) - Get Report

, in addition to certain offshore insurers, according to the



In a separate report, the


said two General Re executives, John Houldsworth and Milan Vukelic, were placed on administrative leave while being investigated in the U.S. and elsewhere. The


cited a person familiar with the situation.