John Lennon’s last producer was the man with a million rock-and-roll stories The Washington PostJack Douglas, Revered Rock Producer for John Lennon and Aerosmith, Dead at 80 Rolling StoneJack Douglas, Producer for John Lennon, Aerosmith, Cheap Trick and More, Dies at 80 VarietyTop 10 Jack Douglas Albums Ultimate Classic RockIconic producer, worked with Aerosmith and John Lennon, dead at 80: He ‘lived a colorful life’ AL.com