As Hamas prepares to release a first group of hostages held for more than six weeks in Gaza, it's worth remembering that Israelis have been held hostage many times over the nation's 75-year history. In October 2011, Franco-Israeli soldier Gilad Shalit was freed by Hamas after being held in captivity for more than five years. He'd been captured during a cross-border raid. In Perspective, we spoke to the man who played a key role in negotiating his release.