Al Schmitt, record producer and engineer celebrated for his work with such varied artists as Frank Sinatra and Steely Dan – obituary He won a record 20 Grammy awards in a career spanning seven decades, and worked on more than 150 gold and platinum albums Al Schmitt in 2010 Credit: Maury Phillips/WireImage Al Schmitt, who has died aged 91, was an American record producer and recording engineer who in a career spanning more than 70 years worked with artists as various as Frank Sinatra, Ray Charles and Jefferson Airplane, and who won a record 20 Grammy Awards, for his work with Henry Mancini, Steely Dan, George Benson, Toto and Quincy Jones, making him the most honoured recording engineer of all time.