Question: Steven Levert "Steve" Clarkson (born October 31, 1961) is an American football coach, Clarkson has tutored Matthew Montgomery Barkley, an American football quarterback who is currently a free agent, born on which date?

full_context: Document 1: Matt McGloin: Matthew James McGloin (born December 2, 1989) is an American football quarterback who is currently a free agent. He was the starting quarterback for the Penn State Nittany Lions football team from 2010 to 2012. He is the first walk-on quarterback to start at Penn State since scholarships were reinstated in 1949. Prior to his college career, McGloin was a Pennsylvania all-state quarterback while attending West Scranton High School.
Document 2: Colin Kaepernick: Colin Rand Kaepernick ( ; born November 3, 1987) is an American football quarterback who is currently a free agent. Kaepernick played college football at the University of Nevada, where he was named the Western Athletic Conference (WAC) Offensive Player of the Year twice and became the only player in NCAA Division I FBS history to amass 10,000 passing yards and 4,000 rushing yards in a career. After graduating, he was selected by the San Francisco 49ers in the second round of the 2011 NFL Draft.
Document 3: Matt Leinart: Matthew Stephen "Matt" Leinart (born May 11, 1983) is a former American football quarterback who now works as a studio analyst for Fox Sports’ college football coverage. He played college football at the University of Southern California (USC) from 2001 to 2005. He was the starting quarterback for the Trojans in 2003, 2004, and 2005. As junior in 2004, he won the Heisman Trophy. Leinart played professionally in the National Football League (NFL) for the Arizona Cardinals (2006–2009), Houston Texans (2010–2011), Oakland Raiders (2012), and Buffalo Bills (2013). Leinart signed a deal with the Pac-12 Network, making his official debut as a Studio Analyst on August 30, 2014. He is a recurring guest, via voicemail, on the Barstool Sports podcast Pardon My Take. Leinart will be inducted into the College Football Hall of Fame in 2017.
Document 4: Clayton Thorson: Clayton James Thorson is an American football quarterback. He is currently a redshirt junior and the starting quarterback for the 2017 Northwestern Wildcats football team. After redshirting in 2014, he was named the starting quarterback in 2015 and led the Wildcats to the third 10-win season in program history. As a starter for the 2016 team, he earned Academic All-Big Ten honors. Thorson was selected by ESPN.com as the seventh best high school quarterback and played in the 2014 Semper Fidelis All-American Bowl.
Document 5: Clay Matthews III: William Clay Matthews III (born May 14, 1986) is an American football outside linebacker for the Green Bay Packers of the National Football League (NFL). After attending Agoura High School in Agoura Hills, California, Matthews was a walk-on student athlete at the University of Southern California for the USC Trojans football team under head coach Pete Carroll. At USC, Matthews was a standout special teams player, winning three consecutive Special Teams Player of the Year awards from 2006 to 2008; he also played reserve outside linebacker. In these roles, he was part of three Pac-10 Championship teams.
Document 6: Steve Clarkson: Steven Levert "Steve" Clarkson (born October 31, 1961) is an American football coach. Based in Pasadena, California, he is considered a top quarterback coach. Clarkson has tutored Ben Roethlisberger, Brett Hundley, Matt Leinart, J. P. Losman, Gino Torretta, Matt Barkley, Tim Tebow, Josh Freeman, and Jimmy Clausen, among others. Clarkson is also known for helping to get offers for David Sills from University of Southern California and Tate Martell from the University of Washington at ages of 13. David Sills currently attends West Virginia University and Tate Martell has committed to Ohio State University.
Document 7: Matt Schaub: Matthew Rutledge Schaub (born June 25, 1981) is an American football quarterback for the Atlanta Falcons of the National Football League (NFL). He played college football for the University of Virginia, and was drafted by the Falcons in the third round of the 2004 NFL Draft. He has also played for the Houston Texans, Oakland Raiders and Baltimore Ravens.
Document 8: Terry Shea: Terence William Shea (born June 12, 1946) is an American football coach and former player. Currently, Shea does quarterback consulting work for future NFL draft prospects. Most recently he worked with Robert Griffin III "RG3" (2nd overall pick 2012), Blaine Gabbert (10th overall pick 2011), Sam Bradford (1st overall pick 2010), Matthew Stafford (1st overall pick 2009), and Josh Freeman (17th overall pick 2009. whom Shea later brought to the Bolts in 2015). Shea also trained and developed current college quarterbacks Collin Klein (Kansas State) and Tommy Rees (Notre Dame).
Document 9: Jon Kitna: Jon Kelly Kitna (born September 21, 1972) is an American football coach and former quarterback. After playing college football for Central Washington University, he signed with the Seattle Seahawks in 1996 and was allocated to the Barcelona Dragons of NFL Europe in 1997. He led the Dragons to a World Bowl championship, and became the starting quarterback for the Seahawks in 1998 after spending the 1997 and most of the 1998 seasons as the backup to Warren Moon. Following a four-year stint with Seattle, Kitna signed with the Cincinnati Bengals in 2001. He played for the Bengals from 2001 to 2005 as their starting quarterback, and, later, the mentor to Carson Palmer. He was a member of the Detroit Lions from 2006 to 2008, and the Dallas Cowboys from 2009 to 2011.
Document 10: Steve Clark (American football): Stephen Spence Clark (born August 2, 1960) is a former professional American football player who played [[defensive tackle]and offensive guard ] for five seasons for the [[Miami Dolphins]]. He also played on two state championship teams in high school which were a combined (25-1) over two years and was a five team all-American including "Parade Magazine", he was also named Most Valuable Player of the state of Utah. At the University of Utah he was named two time All-WAC defensive tackle, Defensive Most Valuable Player of the Western Athletic Conference and First Team All-American. He also played in the East-West Shrine Game and was named MVP of the Senior Bowl. After the Senior Bowl he was drafted by Don Shula and The Miami Dolphins, his second year in the NFL he played both ways in a pre-season game and Coach Shula knew he had a guy that could back up every position on the offensive and defensive line as well as long snap. He earned a starting position at right guard and played against [[William Perry (American football)|the Fridge]] when the Dolphins beat the Chicago Bears on Monday Night Football to help keep the undefeated Dolphin record intact. In the NFL, he also played on two Super Bowl teams with the Miami Dolphins and was the starting right guard before being injured. Just recently Steve was named to the top 100 greatest players in the history of the University of Utah actually being named 9th best of All-Time.
Document 11: Sam Bradford: Samuel Jacob Bradford (born November 8, 1987) is an American football quarterback for the Minnesota Vikings of the National Football League (NFL). Bradford attended Putnam City North High School in Oklahoma City, where he starred in football, basketball and golf. As a senior quarterback in 2005, he threw for 2,029 yards and 17 touchdowns in 12 games. Bradford was not highly recruited coming out of high school, but he did receive a scholarship offer from the University of Oklahoma, which he accepted. After a redshirt season in 2006, Bradford threw for 3,121 yards and 36 touchdowns as a redshirt freshman. That set the stage for a phenomenal 2008 year, when Bradford became only the second sophomore to win the Heisman Trophy as he was the trigger man for the highest-scoring offense in NCAA history, throwing for 4,464 yards with 48 touchdowns and just six interceptions. He again led the nation in passing and also added five rushing touchdowns as the Sooners went 12-1 and advanced to the BCS national title game. Bradford declared for the NFL draft following the 2009 season and was drafted by the St. Louis Rams with the first overall pick in the 2010 NFL Draft.
Document 12: Matt Simms (American football): Matthew Phillip Simms (born September 27, 1988) is an American football quarterback who is currently a free agent. He played college football at Tennessee, before being signed by the New York Jets as an undrafted free agent in 2012.
Document 13: Matt Ryan (American football): Matthew Thomas Ryan (born May 17, 1985), nicknamed "Matty Ice", is an American football quarterback for the Atlanta Falcons of the National Football League (NFL). After playing college football for Boston College, Ryan was drafted by the Falcons with the third overall pick in the first round of the 2008 NFL Draft.
Document 14: Steve Sarkisian: Stephen Ambrose Sarkisian (born March 8, 1974) is an American football coach and former player who is currently the offensive coordinator for the Atlanta Falcons of the National Football League (NFL). He has served as the head football coach of the University of Washington from 2009 to 2013 and at the University of Southern California (USC) from 2014 to 2015. He played college football as a quarterback at Brigham Young University (BYU) and professionally with the Saskatchewan Roughriders of the Canadian Football League (CFL).
Document 15: Matt Barkley: Matthew Montgomery Barkley (born September 8, 1990) is an American football quarterback who is currently a free agent. He played college football at USC, and was drafted by the Philadelphia Eagles in the fourth round of the 2013 NFL Draft. Barkley has also played for the Arizona Cardinals, Chicago Bears and San Francisco 49ers.
ground_truth: September 8, 1990