Mark William Calaway (born March 24, 1965), better known by his ring name The Undertaker, is an American professional wrestler. He is currently signed to the prommotion WWE, where he has worked since 1990, making him WWE's longest-tenured performer and he is also currently an advisor for NXT.

Calaway began his wrestling career with World Class Championship Wrestling (WCCW) in 1984. After wrestling for World Championship Wrestling (WCW) as "Mean" Mark Callous from 1989 to 1990, he signed with the World Wrestling Federation (WWF, now WWE) in 1990. As The Undertaker, his gimmick is that of a macabre entity who employs scare tactics and has links to the supernatural. He is the storyline half-brother of fellow WWE wrestler Kane, with whom he has alternately feuded and teamed with as The Brothers of Destruction. Since unseating Hulk Hogan as WWF Champion in 1991, The Undertaker has been involved in various pivotal storylines and matches within WWE history.

The Undertaker holds a record 21 straight victories at WWE's annual WrestleMania pay-per-view (including main event bouts at WrestleMania 13, WrestleMania XXIV, and WrestleMania XXVI), sustaining his first loss at WrestleMania XXX to Brock Lesnar, and was the winner of the 2007 Royal Rumble. Among other accomplishments, Calaway is a four-time WWF/E Champion, three-time World Heavyweight Champion, and one-time USWA Unified World Heavyweight Champion.

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