Veteran literary agent Bart Walker is joining the Gersh Agency as senior partner after having spent the last 10 years as a partner with ICM, TheWrap has confirmed. Walker brings with him top clients across film, television, and theater, including Oscar winner and nominees David Byrne, Lisa Cholodenko, Sofia Coppola, Tamara Jenkins, Spike Lee, Mira Nair, Oliver Stone and Thomas Vinterberg.