His website shows him still an active musician, but the discography only lists his most recent and/or most sizzling collaborations:
I know him to have worked as arranger for Jack Jones and Steve Lawrence (and to have done truly bang-up work for them), but neither are mentioned as you can see. The Henry/Monica Mancini cd was great, with new interpretations of HM tunes that surprised me a lot.
Do you know of any other singers he's arranged for, outside of film?
Patrick Williams started out composing jingles for commercials such as for Diet Rite Cola ("What You Got To Lose") before he ever scored ffeature films and television shows. He did some arranging for Billy Joel too.