Judge Mark Bennett is in his 23rd year as a U.S. district judge in the Northern District of Iowa. This article is a summary of a longer, more detailed, and heavily footnoted law review article he wrote in 2015. See Mark W. Bennett, Unspringing the Witness Memory and Demeanor Trap: What Every Judge and Juror Needs to Know About Cognitive Psychology and Witness Credibility, 64 Am. U.L. Rev. 1331 (2015). For ease of reading, Judge Bennett chose not to include footnotes here, but a link to the full law review article may be found on Judicature’s website.