in april 2010, ninivaggi joined icahn enterprises l.p. as its president, overseeing icahn’s portfolio companies and certain investments. he was promoted to chief executive officer in august 2010. as ceo of icahn enterprises, ninivaggi was involved in various industries, including oil refining, railcar manufacturing and leasing, telecommunications, automotive, textiles, real estate, food packaging and metals recycling. ninivaggi also served on various boards, including the board of motorola mobility at the time it was sold to google, and was involved in several activist campaigns.