Which entity is this text about?

Kurtis Eugene Warner (born June 22, 1971) is a former American football quarterback. He played for three National Football League (NFL) teams: the St. Louis Rams, the New York Giants, and the Arizona Cardinals. He was originally signed by the Green Bay Packers as an undrafted free agent in 1994 after playing college football at Northern Iowa. Warner went on to be considered the best undrafted NFL player of all time, following a 12-year career regarded as one of the greatest stories in NFL history.

Prior to the 1999 free-agency period, the Rams chose Warner to be one of the team's five unprotected players in the 1999 NFL Expansion Draft. Warner went unselected by the Cleveland Browns, who chose no Rams and whose only quarterback selection was Scott Milanovich.  The Rams let Bono leave in free agency and signed Trent Green to be the starter. Banks was traded to the Ravens, and Warner now found himself second on the depth chart. After Green tore his ACL in a preseason game, Rams coach Dick Vermeil named Warner as the Rams' starter. In an emotional press conference, Vermeil--who hadn't seen Warner work with the first-string offense--said, "We will rally around Kurt Warner, and we'll play good football." With the support of running back Marshall Faulk and wide receivers Isaac Bruce, Torry Holt, Az-Zahir Hakim, and Ricky Proehl, Warner put together one of the top seasons by a quarterback in NFL history, throwing for 4,353 yards with 41 touchdown passes and a completion rate of 65.1%. The Rams' high-powered offense, run by offensive coordinator Mike Martz, was nicknamed "The Greatest Show on Turf" and registered the first in a string of three consecutive 500-point seasons, an NFL record.  Warner threw three touchdown passes in each of his first three NFL starts; he is the only NFL quarterback in history to accomplish that feat. Warner drew more attention in the Rams' fourth game of the season, a home game against the San Francisco 49ers (who had been NFC West division champions for 12 of the previous 13 seasons). The Rams had lost their last 17 meetings with the 49ers, but Warner proceeded to throw a touchdown pass on each of the Rams' first three possessions of the game, and four touchdowns in the first half alone, to propel the Rams to a 28-10 halftime lead on the way to a 42-20 victory. Warner finished the game with five touchdown passes, giving him 14 in four games and the Rams a 4-0 record. Warner's breakout season from a career in anonymity was so unexpected that Sports Illustrated featured him on their October 18 cover with the caption "Who Is This Guy?" He was named the 1999 NFL MVP at the season's end for leading the Rams to their first playoff berth since 1989 (when they were still in Los Angeles) and their first division title since 1985.  In the NFL playoffs, Warner ultimately led the Rams to a victory in Super Bowl XXXIV against the Tennessee Titans. In the game, he threw for two touchdowns and a then Super Bowl-record 414 passing yards, including a 73-yard touchdown to Isaac Bruce when the game was tied with just over two minutes to play, which proved to be the game-winning score. Warner also set a Super Bowl record by attempting 45 passes without a single interception. For his performance, Warner was awarded the Super Bowl MVP award.
Kurt Warner