Grand Master Sexay, as Brian Christopher, joined the World Wrestling Federation (WWF) in 1997 and began competing in the light heavyweight division. Taka Michinoku defeated him in the finals of a tournament for the Light Heavyweight Championship. In mid-1998, he started teaming up with Scott "Too Hot" Taylor to form the tag team Too Much.
When he was known as Brian Christopher, his father Jerry Lawler would talk him up as being superior to all the other light heavyweights but never publicly acknowledged that Brian was his son, although after Paul Heyman revealed that fact on Raw, Jim Ross always hinted at it.
On the June 13, 1999, episode of Heat, Brian and Scott adopted the ring names Grand Master Sexay and Scotty 2 Hotty, returning after a hiatus. Their tag team was renamed Too Cool, and they were later joined by Rikishi. They defeated Edge and Christian in May 2000 on Raw to become the WWF Tag Team Champions. They were even occasionally involved with top-card feuds, notably being enemies to the McMahon-Helmsley Faction and their associates, such as The Radicalz, Edge and Christian, and T&A. The trio's run ended in late 2000 when Rikishi was revealed as the man behind the wheel of the car that hit Stone Cold Steve Austin at Survivor Series. Shortly after, Rikishi turned on his teammates.
While Scotty was sidelined in 2001 with a broken ankle, Sexay formed a short-lived tag team with Steve Blackman, but was released from the company later that year.
In April 2004, Christopher was signed back to the WWE roster. He only appeared in four matches: against Kane, Wavell Starr, Christian, and Garrison Cade. He was later released after only one month with the company. Prior to his release, he was scheduled to take part in a battle royal for the number one contendership for the World Heavyweight Championship, but he was replaced by Maven.
On the March 14, 2011 episode of Raw, he returned to the WWE as a heel in a segment between Michael Cole and his father, Jerry Lawler, where Brian would side with Cole, saying that he felt that Jerry never cared for him and that he was ashamed to be his son. Lawler indirectly agreed, telling Brian that he was a bigger screw-up than Charlie Sheen.
He returned to the WWE on January 6, 2014, appearing on the "Old School" edition of Raw and reuniting with Rikishi and Scotty 2 Hotty, for what would be the final time, to take on 3MB in a six-man tag team match. His team was successful in winning. He made what would be his final WWE appearance, on NXT Arrival in February 2014 as part of Too Cool in a losing effort as mystery opponents to The Ascension, who successfully defended their NXT Tag Team Championship against them.
On July 29, 2018, Christopher passed away.