Borg died Wednesday at his home in Portland, Oregon, according to his publisher, HarperOne. The publisher announced Thursday that Borg had been suffering from idiopathic pulmonary fibrosis, a scarring or thickening of the lungs that makes it difficult to breathe.
A popular speaker, frequent television commentator and the author or co-author of more than 20 books, Borg was among a group of scholars known as the Jesus Seminar that emerged in the 1980s and offered a skeptical look at the accounts of his life in the Gospels.