PHOTOGRAPH BY TODD HEISLER/THE NEW YORK TIMES REED SAXON) Over his five-decade career. Alan Dershowitz has defended celebrities such as. from left Claus von Wow. trailed by reporters in 1985 Leona Helmsley. with her husband, Harry, in 1991 Mike Tyson. in 1994 and O.J. Simpson. in 1995. (PHOTOGRAPHS BY DAVE