He takes a daily stroll with Mark Whitacre, the Archer Daniels Midland whistle-blower who is serving a ten-and-a-half-year sentence for fraud.

FORBES: Ring of Thieves

It is something he wrote about in a book he wrote with Stevin Hoover, Mark Whitacre Against All Odds.

FORBES: Mark Whitacre (aka The Informant) Delivers Keynote Address at ACFE Conference

At first, we think that Mark Whitacre (Matt Damon, with a wavy pompadour and steel-rimmed glasses) is the epitome of Midwestern square.

NEWYORKER: The Informant!