Prolific American mastering engineer. Eberle was born 15 July 1939 and died 12 April 2019 in Dickson, Tennessee, at 79 years of age. Eberle worked for more than 30 years at Americana Mastering, which he ran himself. In 2014 Eberle completely retired from mastering as his health declined. In 2017 John Eberly was awarded a Lifetime Achievement Award by the Audio Engineering Society in Nashville.