In one of his final posts, (the now late) Larry Hurtado reviews Archibald Hunter’s Paul and His Predecessors.
Hunter’s thesis was that, although the Apostle Paul was an innovative and impressive thinker and defender of his mission, he was also heavily indebted to “those who were in Christ” before him. Hunter conducted several investigations of Pauline texts to demonstrate this, and he did so persuasively in my view.
As early as 2004, the full text of the revised 1961 edition of Hunter’s volume was made available on Internet Archive by the Universal Library Project.