"Yosh," as he has been nicknamed, currently lives and works in Franklin, Tennessee, south of Nashville He is a well-known engineer in R&B and gospel music.
John Jaszcz got his start in Detroit as an engineer for records by Parliament-Funkadelic, Bootsy Collins, George Clinton, Zapp, and Commissioned.
Jaszcz's move to Tennessee facilitated his involvement in country and rock music working with artists including Billy Ray Cyrus, John Michael Montgomery, and Collective Soul.
In 2010, he began an independent record label, Yosh Bros Entertainment, as a platform for artists he produces.
Along with producer and music engineer John Mike, he released a second volume of a drum library (collection) featuring Kevin Kelley, a session drummer.