Question: Who was the manager above tenth Pittsburgh Steeler head coach Mike Tomlin?

Documents:
source: 2015 Pittsburgh Steelers season
text: 2015 Pittsburgh Steelers season The Pittsburgh Steelers season was the franchise's 83rd season as a professional sports franchise and as a member of the National Football League (NFL). It also marked the 16th season under leadership of general manager Kevin Colbert and the ninth under head coach Mike Tomlin. For the first time since 2003, safety Troy Polamalu was not on the opening day roster, as he announced his retirement on April 9.

source: Mike Tomlin
text: Mike Tomlin Michael Pettaway Tomlin (born March 15, 1972) is an American football coach who is the head coach of the Pittsburgh Steelers of the National Football League (NFL). Tomlin is the fifth youngest head coach in any of the four major North American professional sports. He is the tenth coach in Steelers history. With the victory in Super Bowl XLIII on February 1, 2009 against the Arizona Cardinals, Tomlin became the youngest head coach in NFL history to lead his team to a Super Bowl championship.

source: 2012 Pittsburgh Steelers season
text: 2012 Pittsburgh Steelers season The Pittsburgh Steelers season was the team's 80th season as a member of the National Football League (NFL). It was the 13th season under the leadership of general manager Kevin Colbert and the 6th under head coach Mike Tomlin. The Steelers failed to improve on their 12–4 record from 2011 and did not reach the postseason for the first time since 2009. The Steelers finished the season with a record of 8–8, their first non-winning season since 2006. The 2012 Steelers set a new NFL record for the most games decided on the last play, with 6. Steelers Hines Ward was not on the team's roster, as he was released in March 2012. Ward retired after he was cut.

source: 2017 Pittsburgh Steelers season
text: 2017 Pittsburgh Steelers season The 2017 Pittsburgh Steelers season is the franchise's 85th season as a professional sports franchise and as a member of the National Football League. It marks the 18th season under leadership of general manager Kevin Colbert and the eleventh under head coach Mike Tomlin. It is also the Steelers' first season without the ownership of Dan Rooney, as he died on April 13, 2017.

source: 2010 Pittsburgh Steelers season
text: 2010 Pittsburgh Steelers season The 2010 Pittsburgh Steelers season was the team's 78th season as a professional sports franchise and as a member of the National Football League, the eleventh season under the leadership of general manager Kevin Colbert, and the fourth under head coach Mike Tomlin.

source: 2014 Pittsburgh Steelers season
text: 2014 Pittsburgh Steelers season The Pittsburgh Steelers season was the franchise's 82nd season as a professional sports franchise and as a member of the National Football League. It also marked the 15th season under leadership of general manager Kevin Colbert and the eighth under head coach Mike Tomlin.

source: 2013 Pittsburgh Steelers season
text: 2013 Pittsburgh Steelers season The Pittsburgh Steelers season was the franchise's 81st season as a professional sports franchise and as a member of the National Football League. It also marked the 14th season under leadership of general manager Kevin Colbert and the seventh under head coach Mike Tomlin.

source: 2011 Pittsburgh Steelers season
text: 2011 Pittsburgh Steelers season The 2011 Pittsburgh Steelers season was the team's 79th season as a professional sports franchise and as a member of the National Football League (NFL). It was the twelfth season under the leadership of general manager Kevin Colbert and the fifth under head coach Mike Tomlin. The Steelers hoped to return to the Super Bowl and defend their AFC championship from 2010, but suffered a 29–23 overtime loss to the Denver Broncos in the Wild Card round of the playoffs. The Steelers played all of their home games at Heinz Field in Pittsburgh, Pennsylvania.

source: Bill Cowher
text: Bill Cowher William Laird Cowher (born May 8, 1957) is a former professional American football coach and player in the National Football League (NFL). In Cowher's 15 seasons as head coach of the Pittsburgh Steelers, the team won eight division titles and made 10 playoff appearances. Cowher led the Steelers to the Super Bowl twice, winning one. He is the second coach in NFL history to reach the playoffs in each of his first six seasons as head coach, a feat previously accomplished by Paul Brown. Cowher resigned as head coach of the Steelers on January 5, 2007, 11 months after winning Super Bowl XL in 2006 over the Seattle Seahawks. Cowher was replaced by current Steelers head coach Mike Tomlin. Before being hired by the Steelers in 1992, Cowher served as an assistant coach for the Cleveland Browns and Kansas City Chiefs under head coach Marty Schottenheimer. He is currently a studio analyst for "The NFL Today".

source: 2016 Pittsburgh Steelers season
text: 2016 Pittsburgh Steelers season The 2016 season was the 84th in the history of the Pittsburgh Steelers as a professional sports franchise and as a member of the National Football League (NFL). It also marked the 17th season under leadership of general manager Kevin Colbert and the 10th under head coach Mike Tomlin. For the first time since 2004, tight end Heath Miller was not on the opening day roster, as he announced his retirement on February 19, 2016.

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Answer: Kevin Colbert