The phrase "collaborating with him on" is a correct and usable phrase in written English.
For example, you could say "I enjoyed collaborating with him on the project."
Lisa Tuttle, who has been a close friend of the writer since the early 1970s, collaborating with him on one of his earliest novels, remembers travelling to London for the launch of his latest book, A Dance with Dragons, in 2011.
Are you already collaborating with him on it?
Joanne Lake, whose husband, Paul, played in the same City team, is collaborating with him on the book.
So affecting was Bengie's story that Davidson's wife, Emily, is now collaborating with him on his biography.
Feiffer spent five years with Eisner, starting in 1946, collaborating with him on a classic crime-fighter newspaper comic called "The Spirit".
Yet, after two years of collaborating with him on a book, I've come to realise that he is, in fact, open, warm, good company and a great storyteller.
He led Banda Cê, the three musicians who collaborated with him on his 2006 album, "Cê" (Nonesuch), and his latest one, "Zii e Zie" (Nonesuch), which won a Latin Grammy Award after its release in Brazil last year.
(Not incidentally, Drake, a fellow Canadian, was one of The Weeknd's earliest co-signers, and collaborated with him on four of Take Care's tracks).
He also met Mercer there and collaborated with him on songs like "Hooray for Hollywood".
Mr. Cameron said he had hired screenwriters to collaborate with him on scripts for the films.
In 1904 Seligman married Brenda Z. Salaman, who collaborated with him on his later expeditions and writings.
