Answer
Yes, Jack Dempsey held the heavyweight championship title for over seven years, from 1919 to 1926. During his reign as champion, Dempsey successfully defended his title five times, defeating notable challengers such as Georges Carpentier, Tommy Gibbons, and Luis Ángel Firpo. His impressive performances and aggressive fighting style made him a fan favorite and solidified his status as one of the greatest heavyweight boxers of all time.