Question: How many seasons did the host of Inside the Vault play for the National Football League?

Context paragraphs:
List of PAOK FC seasons: PAOK FC is a football club based in Thessaloniki, that competes in Superleague, the most senior football league in Greece.  The club was formed on 20 April 1926 by Greek refugees from Constantinople, and played their first official encounter on 12 December 1926, prevailing 3-1 over Nea Genea.  Initially PAOK played against other local clubs in Macedonia FCA (EPSM).  In 1927-28, PAOK took part in the Macedonia FCA A’ League for the first time.  In 1930-31 they qualified for their maiden participation in the Panhellenic Championship.  From 1930 to 1959 PAOK played in the Macedonia FCA and participated many seasons to the Panhellenic Championship.

2017 FA Trophy Final: The 2016–17 FA Trophy Final was the 48th final of the Football Association's cup competition for teams at levels 5–8 of the English football league system.  The match was contested between Macclesfield Town and York City.  The final of the FA Vase was played on the same day at the same venue for the second year running.  Both matches were televised in the UK on BT Sport.  York City won the final 3-2 and became the second club in as many seasons, after Halifax last year, to get relegated from the National League and then win the FA Trophy in the same season.

Bob Ravensberg: Robert Alexander Ravensberg (October 20, 1925 – February 12, 2007) was an American football player.  Ravensberg was born in Bellevue, Kentucky, where his family operated a diner.  He was a two-time Kentucky high school pole vault champion who set a state record in the event.  He enrolled at the University of Indiana where he won varsity letters in football in 1943, 1944, 1945 and 1947.  He was a starter on Indiana's 1945 team, the school's only undefeated and outright Big Ten Conference championship team.  In 1945, he was selected as a consensus first-team All-American football player at the end position.  After graduating from Indiana, Ravensberg played two seasons of professional football in the National Football League (NFL) for the Chicago Cardinals from 1948 to 1949.  He was an assistant football coach at the Indiana from 1950 to 1951.

Brendan Parker: Brendan Parker (born 23 March 1971) is a former Australian rules footballer who played with Carlton in the Australian Football League (AFL).  A centre half forward from Nathalia in the Murray Football League, Parker moved to Tongala in 1991 and won the Morrison Medal, Goulburn Valley Football League best and fairest in his first season.  He was subsequently drafted by Carlton.  Given limited senior opportunities in his two seasons with the Blues, Parker only managed five AFL games despite playing well in the reserves where he kicked 90 goals from 35 matches.  After being delisted at the end of 1993, Parker moved to play for North Adelaide in the South Australian National Football League.  He played over 100 games for North Adelaide before returning to coach Tongala for two seasons, then moving onto Geelong Football League team Newtown Chilwell before coming back home Nathalia, where he won four premierships and kicked over 100 goals in four consecutive seasons.

Cris Collinsworth: Anthony Cris Collinsworth (born January 27, 1959) is a former professional American football player who was a wide receiver in the National Football League (NFL) for eight seasons, all with the Cincinnati Bengals, during the 1980s.  He played college football for the University of Florida, and was recognized as an All-American.  He is currently a television sportscaster for NBC, Showtime, and the NFL Network and winner of 15 Sports Emmy Awards.  He is also the owner of Pro Football Focus, a sports statistic monitoring service.

Derby di Sicilia: The Derby di Sicilia or Sicilian Derby in English, is a local derby between Italian football clubs Calcio Catania and U.S. Città di Palermo.  Catania and Palermo are the two main cities on the island of Sicily, and the teams are fierce rivals.  However, they have seldom played each other within the Italian football league system, because in many seasons they have played in separate divisions of the league.  The first time the Sicilian derby took place in the context of league football was on November 1, 1936, at Palermo in Serie B level; it ended in a 1–1 draw.  The Sicilian derby has been played 10 times in Serie A: Catania leading their rivals by 5 victories to Palermo's 4; the other occasion was drawn.  The teams have also met in local Sicilian competitions, and friendly matches.

Börje Salming: Anders Börje Salming (] ; born 17 April 1951), nicknamed "The King", is a Swedish retired professional ice hockey defenceman.  He played for Brynäs IF, the Toronto Maple Leafs, the Detroit Red Wings, and AIK.  Salming was one of the first European players to make an impact in the National Hockey League (NHL), paving the way for future generations of players.  He was one of the premier defencemen of his era in the NHL, and was recognized for this by being inducted into the Hockey Hall of Fame in 1996.  Remembered for his many seasons with the Maple Leafs, he holds numerous franchise records, including most assists.  Salming also played extensively for Sweden in international play.  He was recognized for this by being selected to the International Ice Hockey Federation (IIHF) Centennial All-Star Team.  On 27 January 2017, in a ceremony during the All-Star Weekend in Los Angeles, Salming was part of the second group of players to be named one of the '100 Greatest NHL Players' in history.

1969 WANFL season: The 1969 WANFL season was the 85th season of the Western Australian National Football League.  It saw continued dominance by the three Perth clubs and Subiaco, who occupied the top half of the ladder constantly from the fourth round onwards, and finished four games clear of the other four clubs, who were all in a “rebuilding” mode with varying success – late in the season both Swan Districts and Claremont fielded some of the youngest teams in the competition’s history, whilst the Tigers, who fielded thirteen first-year players including Graham Moss, Russell Reynolds and Bruce Duperouzel, began disastrously but four wins in five games paved the way to impressive record from 1970 to 1972.  Among the top four, Perth failed to achieve a fourth consecutive premiership that at one point looked very much in their grasp due to the overwork of Barry Cable which robbed him of some brilliance, early-season injuries to key players Iseger and Page and a couple of surprising losses to lower clubs, whilst East Perth, who won consistently without being impressive for most of the season, failed for the fourth time in as many seasons in the Grand Final, this time to West Perth and in a much more decisive manner than any of their Perth defeats.

Inside the Vault: Inside the Vault is an American news magazine television show hosted by Cris Collinsworth that focuses on today’s American man.  The show debuted online on February 3, 2011, and February 4, 2011 on WGN America.  After its first season no plans were announced for a second season.

Tom Johnson (gridiron football): Tom Johnson (born August 30, 1984) is an American football defensive tackle for the Minnesota Vikings of the National Football League (NFL).  He attended Moss Point High School, where he played as a defensive tackle for two seasons.  He played college football at Southern Miss but before that he played for two seasons of junior college football at Mississippi Gulf Coast Community College (MGCCC) in Perkinston, MS.  Following his college career, Johnson went undrafted in the 2005 NFL Draft.  He was signed by the Indianapolis Colts as an undrafted free agent.  He spent the 2007 season with the Cologne Centurions of the NFL Europe and came back with the Colts for training camp in 2008.  After being released, he turned to the Arena Football League (AFL), where he played the 2008 season with the Grand Rapids Rampage and the Philadelphia Soul.  Johnson then headed north to play in the Canadian Football League (CFL), where he played two seasons for the Calgary Stampeders and was named CFL West Division All-Star in 2010.  At the end of the 2010 CFL season, Johnson drew interest from several NFL teams, and decided to sign with the New Orleans Saints, where he played from 2011-13.  In 2014, he became a free agent and joined the Minnesota Vikings on a one-year deal, and after exceeding expectations in his first season, he was re-signed to a three-year deal in 2015.

Supporting paragraphs: Inside the Vault Cris Collinsworth
Answer: eight seasons