David Barton is a Texas-based pseudo-historian much beloved by the Religious Right. Barton doesn’t actually have a degree in history—he graduated from Oral Roberts University with a degree in Christian Education—but that hasn’t stopped him from posing as a professor.
Barton is buddies with Glenn Beck, who uses him as “faculty” for online classes that are marketed to gullible people. 

For what it is worth I don’t believe you need a special degree to be a historian, and having the credentials to be an on-paper credible historian does not make you correct, accurate, or even honest.

In the case of David Barton it is unclear whether the history professor of the right-wing echo chamber is a charlatan or simply incompetent.

As it is, despite accurately assessing David Barton, Rob Boston is not himself always on target within the article.