Calvin's Commentaries is comprised of 22 volumes, including commentaries on 24 books of the Old Testament and all of the New Testament except for 2 & 3 John and Revelation. Calvin completed these commentaries in a 15 year span from 1540-1555.
John Calvin, a prolific scholar and French theologian, was a pastor during the Protestant Reformation and a principal figure in the development of the system of Christian theology, which is now referred to as Calvinism.