Marcus Joel Borg was an American New Testament scholar and theologian. He was among the most widely known and influential voices in Liberal Christianity. Borg was a fellow of the Jesus Seminar and a major figure in historical Jesus scholarship. He retired as Hundere Distinguished Professor of Religion and Culture at Oregon State University in 2007. He died eight years later at the age of 72, of idiopathic pulmonary fibrosis at his home in Powell Butte, Oregon.

The Jesus Seminar was a group of about 50 biblical criticism scholars and 100 laymen founded in 1985 by Robert Funk that originated under the auspices of the Westar Institute. The seminar was very active through the 1980s and 1990s, and into the early 21st century.