James William Guercio
From Zappa Wiki Jawaka
Jim Guercio, born James William Guercio, (born in 1945 in Chicago, Illinois) was hired as a replacement for Ray Collins by to play guitar and sing for the MOI; however, that arrangement was very short lived.
He made his name circa 1970 as producer of records by Blood, Sweat & Tears and Chicago Transit Authority. Also produced an album in 1968 called "The Illinois Speed Press" which anticipated The Allman Brothers Band twin-guitar sound. Parlayed this success into one-shot attempt as film director, Electra Glide in Blue.
He built Caribou Studios in Colorado, where FZ recorded in late '74.
Guercio one of the names listed on the cover of Freak Out!