Mark William Calaway (born March 24, 1965) is an American professional wrestler, better known by his ring name The Undertaker. He is signed to World Wrestling Entertainment (WWE), currently wrestling on the SmackDown brand.

Calaway began his wrestling career with World Class Championship Wrestling in 1984. He joined World Championship Wrestling (WCW) in 1989. When WCW did not renew Calaway's contract in 1990, he joined the World Wrestling Federation (which later became World Wrestling Entertainment in 2002) as The Undertaker in November of that year. Having remained with that company ever since, Calaway is currently one of the senior performers in WWE. He is one of only two wrestlers (the other being Shawn Michaels) to have appeared on the very first episode of Raw who are still with the company today.Michaels, Shawn. 2005, Heartbreak & Triumph: The Shawn Michaels Story, Pocket Books, New York. (p.251)