Final answer:
The Epistle of James is believed to be written by James, the brother of Jesus, in the AD 40s or 50s.
Step-by-step explanation:
The author of the Epistle of James is believed to be James, who was the brother of Jesus. This letter was penned around the AD 40s or 50s, making it one of the earliest books in the New Testament.
Learn more about Authorship and date of the Epistle of James