Mark William Calaway (born March 24, 1965; ht. 6'10"), better known by his ring name The Undertaker, is an American retired professional wrestler currently signed under a legends contract to World Wrestling Entertainment. The Undertaker is one of the most recognizable figures in the history of professional wrestling. His tenure with WWE (formerly WWF) spans 30 years and is the longest of any wrestler in the company's history. His retirement in 2020 left him as the only remaining active wrestler to appear on the first episode of WWF Monday Night Raw (now WWE Raw) in 1993.

He began his wrestling career with World Class Championship Wrestling (WCCW) in 1984. He end up in World Championship Wrestling (WCW) as "Mean" Mark Callous by 1989. When WCW did not renew his contract in 1990, he signed with the World Wrestling Federation (WWF later renamed WWE). After debuting as Kane the Undertaker, he shortened it to simply The Undertaker making his television debut at WWF's Thanksgiving themed pay-per-view event the Survivor Series 1990. At the 1990 Survivor Series, The Undertaker would debut alongside The Million Dollar Man Ted DiBiase as part of DiBiase's team in one of the Survivor Series Elimination Tag Team Matches that the annual event is known for. He would eventually go on to be managed by Paul Bearer who would help propel him to the WWF World Title just a year after his debut.

During his time with the WWE, he would go on to hold many championships and accolades most notably a 21-match-long winning streak at WWE's biggest annual event, WrestleMania. Respected amongst fans and peers a like, the Undertaker has one of the most celebrated and long-running careers in all of professional wrestling. We can be sure that for time in memoriam he will be considered one of the greatest of all time.