Among the other acts he worked with extensively through the 1970s include Michael Stanley and the J. Geils Band. While working with The Outlaws, he coined the term "Guitar Army" to describe the band's sound; the name continues as a nickname for the band. He worked in the studio for the Edgar Winter Group's biggest hit, the Rick Derringer-produced "Frankenstein", and later produced Derringer's best known solo album "All American Boy" and its hit single, "Rock and Roll, Hoochie Koo". At the start of the 1980s he was a highly sought-after producer, and worked on such albums as Bob Seger's 1980 album "Against the Wind" and The Who's 1981 release "Face Dances". During this time period, Szymczyk produced such hit singles as Elvin Bishop's "Fooled Around and Fell in Love", The Who's "You Better You Bet", The Eagles' "Hotel California", and Bob Seger's "Against the Wind".