James is believed to have been the leader of the early church in Jerusalem and is traditionally considered to be the author of the Epistle of James. There is some debate among scholars about the authorship of the epistle, with some arguing that it was written by a different James or that it is a composite work of multiple authors.
However, the majority of scholars believe that James, the brother of Jesus, was the author of the epistle. This is based on the strong tradition that attributes the epistle to James, as well as the evidence from the epistle itself, which suggests that it was written by someone closely connected to the early Jerusalem church.
Ultimately, the question of who is the publisher of the Epistle of James is a matter of scholarly debate. While the traditional view is that James, the brother of Jesus, was the author of the epistle, some scholars believe that it was written by a different James or that it is a composite work of multiple authors.