John Parra/Getty Images He worked with artists including Jefferson Airplane, Sam Cooke, Ray Charles, Neil Young, Paul McCartney, Diana Krall, Dr. John, Natalie Cole, Jackson Browne and Bob Dylan. Recording engineer Al Schmitt died at the age of 91 on Monday, according to the his family. With 20 Grammy wins for his work with everyone from Ray Charles to Paul McCartney to Natalie Cole to Steely Dan, Schmitt won more Grammy Awards than any other engineer in music history. In addition to earning a Grammy Lifetime Achievement Award in 2006, he became the first person to win a Grammy album of the year award and a Latin Grammy album of the year award; additionally, he's recorded more than 150 gold and platinum albums.