Peter Lassally, a concentration camp survivor who became known as the “Host Whisperer” for producing talk shows headlined by Johnny Carson, David Letterman and Craig Ferguson, has died. He was 93. Lassally died Sunday of natural causes at a memory care facility in Los Angeles, his son, Tom Lassally, a partner, producer and manager at 3 Arts Entertainment, told The Hollywood Reporter. Lassally had produced programs starring Arthur Godfrey and Mike Wallace before joining Carson on NBC’s The Tonight Show, then based in New York, in 1969. He served as the quiet behind-the-scenes guy in a producing partnership with the boisterous Fred De Cordova and remained with the show until Carson’s final broadcast on May 22, 1992. After just one week off, Lassally jumped to Late Night With David Letterman as an executive producer for what would prove to be the NBC program’s final season. When Jay Leno was picked over Letterman to replace Carson, Lassally advised Letterman what to do next. “I said to Dave, ‘If you’re going to follow Jay Leno at 12:30 when …