When Dan Cohn-Sherbok was growing up in Colorado, his parents were on the fringes of the Wasp world that made up the Denver upper class. They were listed in the city's social register' his father was a surgeon. But the young Dan was aware that there were areas of Denver that were off-limits to Jews. In certain residential districts, no one would sell houses to Jews or blacks. The Country Club and the University Club would not admit Jews as members. "No matter what I might achieve," he remembers, "I knew that the door to that Gentile world was firmly shut." It made him feel "uncomfortable", "marginalised", "an outsider". "I have experienced anti-Semitism," he says, "and I hated …