Movie Preview: Matt Damon Is a Hilarious Informant [2] This trailer for the comedy The Informant has given me perma-grin. A slightly chubbier Matt Damon portrays Mark Whitacre, a real-life "Ivy League Ph.D. who was a rising star at Archer Daniels Midland in the early 1990s. Whitacre secretly gathered hundreds of hours of video and audio tapes over several years to present to the FBI which became one of the largest price fixing cases in history."