Federal prosecutors filed a plea agreement Wednesday with a New York-based businessman and lawyer charged with lying to federal investigators about his knowledge of a fraudulent stock sale.

Robert Brown, a former partner at New York’s Reitler Brown & Rosenblatt (now Reitler Kailas & Rosenblatt), agreed to plead guilty to obstruction of justice for hiding what he knew about a “pump and dump” scheme involving an unnamed investment firm in Newport Beach, Calif. According to documents filed at the U.S. District Court for the District of Columbia, Brown also helped an executive from the firm, as well as the chief executive officer and a member of the board of directors of a Chinese company, fraudulently transfer more than $25 million through a series of shell companies into accounts they controlled.