Bob Etsy also produced big disco classics such as Donna Summers' "Last Dance." Here's his obit in the Hollywood Reporter.
And here's an interview where he talks about working with Cher.
Bob Etsy was a big part of the two 1979 Casablanca albums, Take Me Home and Prisoner. He produced Prisoner entirely and shared production of Take Me Home with Ron Dante.
From Take Me Home he and with Michelle Aller wrote "Take Me Home," "Wasn't It Good," "Say the Word," and "Git Down (Guitar Groupie)." From Prisoner he and Michelle Aller wrote "Shoppin'," "Hell on Wheels," "Holy Smoke," and "Outrageous." He also co-wrote "Mirror Image" with Michael Brooks.
These Prisoner songs contained one-of-a-kind biographical lyrics meant to give people a view of Cher's life at the time.