Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Jack Harcourt Deveraux, Sr. (born William Earl Johnson) is a fictional character on the soap opera Days of our Lives. He is the most prominent member of the Johnson family and is most famously played by Matthew Ashford. Charming, manipulative, heroic, clever, selfish, arrogant and self-loathing all at the same time, antihero Jack Deveraux is one half of Jack and Jennifer, one of Days of our Lives'' most popular supercouples. Although he entered the story as an outright villain wedging himself violently in between another popular supercouple, Steve Johnson and Kayla Brady, Jack eventually grew to establish himself as a core main character in the Days mythos through his passion, outrageous sense of humor, redemption, and undying love for heroine Jennifer Horton.