Four of ICM’s mover-n'-shaker agents stealthily took off in '95 to form Endeavor. The ICM alums David Greenblatt, Tom Strickler, Rick Rosen and Ari Emanuel, the basis for Jeremy Piven's manic agent character Ari Gold on "Entourage," recruited several experienced partners to create the successful agency. Endeavor represents Dustin Hoffman, Adam Sandler, Ben Affleck, Matt Damon, Jennifer Garner, Keira Knightley and Tina Fey, among others. Its marketing division packages popular third-party content such as "Queer Eye for the Straight Guy" and "Alias." Though two of their best talent-department partners, David Lonner and Steve Rabineau, defected to William Morris in 2003, the agency remains strong and continues to acquire sought-after clientele. —Margo Fortuny