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He is mentioned in the letter from Fred Quincy to David Richards that Michael De Santa finds in Solomon's office in the Murder Mystery. He is referenced to be part of Browne Canyon studio (a possible rival of Fred's Pictures).
According to the letter, he appeared to have had a close relationship with Isaac, with whom he wanted to make a live-action film, much to Fred Quincy's fury. After Isaac's murder, Quincy told Abe to forget about Isaac, and he apparently complied since he had his own skeletons in his closet including some "nasty business with a busboy".