Rabbi Leder's book discourages materialism Stephanie Diani for The New York Times Steven Leder at a party for his new book. BEVERLY HILLS, Calif. IT was dinnertime when the 80 or so invited guests began arriving. Handing off their Benzes and Boxsters to uniformed valets, many of Hollywood's most important agents, producers and studio and network executives followed a brick path to Sandy Grushow's front door. Mr. Grushow is the president of 20th Century Fox Television, and his clout was reflected in the 8,000-square-foot Tudor house he shares with his wife, Barbara, and their two children. A pianist played...