In November of 1970, Bill Spier was a guest of Dick Bertel and Ed Corcoran's for WTIC's The Golden Age of Radio (Full show here - https://goldenage-wtic.org/gaor-08.html). During the course of the wide-ranging interview with both he and his wife, actress June Havoc, Dick Bertel asked Bill Spier about how he came to direct The Adventures of Sam Spade right at the height of his run directing Suspense.