Question: Troy Anthony Barnett a former American football defensive lineman in the National Football League manages an amazing group of teammates at an American company that manufactures footwear, sports and casual apparel headquartered where? 

Context paragraphs:
Keith Willis: Keith Willis (born July 29, 1959) is a former American football defensive lineman in the National Football League and currently the assistant defensive line coach for the Tennessee Titans of the National Football League.

Under Armour: Under Armour, Inc. is an American company that manufactures footwear, sports and casual apparel.  Under Armour's global headquarters is located in Baltimore, Maryland with additional offices located in Amsterdam (European headquarters), Austin, Guangzhou, Hong Kong, Houston, Jakarta, London, Mexico City, Munich, New York City, Panama City (international headquarters), Paris, Pittsburgh, Portland, San Francisco, São Paulo, Santiago, Seoul, Shanghai (Greater Chinese headquarters), and Toronto.

Nolan Harrison: Nolan Harrison III (born January 25, 1969 in Chicago, Illinois) is a former American football defensive lineman who played ten seasons in the National Football League for the Los Angeles/Oakland Raiders, the Pittsburgh Steelers, and the Washington Redskins.  He played college football at Indiana University and was team captain All Big 10 Honorable Mention.  Harrison was drafted in the sixth round of the 1991 NFL Draft.  Harrison was a member of the Delta Chi Fraternity while at IU and received The Distinguished Delta Chi Award from the national Delta Chi Fraternity in 1997.  He went to Homewood-Floosmoor High School in Flossmoor, Illinois and was a three-sport varsity letter winner in wrestling (185 pound weight class and heavyweight), track (400 m relay and mile relay) and football (defensive lineman) and in 2009 his high school football number was officially retired at a ceremony during the halftime of a McDonald's charitable basketball game being played by other former and current NFL players.

Tony Chickillo: Anthony Paul Chickillo (born July 8, 1960) is a former American football defensive lineman who played three seasons in the National Football League with the San Diego Chargers  and New York Jets.  He was drafted by the Tampa Bay Buccaneers in the fifth round of the 1983 NFL Draft.  He played college football at the University of Miami and attended Southwest Miami High School in Miami, Florida.  Chickillo was also a member of the Tampa Bay Storm, Miami Hooters and New Jersey Gladiators of the Arena Football League.  He is the son of NFL player Nick Chickillo and the father of NFL linebacker Anthony Chickillo.

Jeff Faulkner: Jeffrey E. Faulkner (born April 4, 1964 in St. Thomas, U.S. Virgin Islands) is a former American football defensive lineman in the National Football League for the Kansas City Chiefs, Indianapolis Colts, Phoenix Cardinals, New Orleans Saints, Washington Redskins, and the New York Jets.  He also played in the Arena Football League for the Chicago Bruisers, Orlando Predators and the Milwaukee Mustangs.  He played college football at Southern University.  He is distinguished as being the first Virgin Islander and St. Thomian to play in the National Football League.

Oliver Barnett: Oliver Wesley Barnett (born April 9, 1966 in Louisville, Kentucky) is a former American football defensive lineman in the National Football League who played for the Atlanta Falcons, Buffalo Bills, and San Francisco 49ers.

Troy Barnett: Troy Anthony Barnett (born May 24, 1971 in Jacksonville, North Carolina) is a former American football defensive lineman in the National Football League for the New England Patriots and Washington Redskins.  He played college football at the University of North Carolina.  Received the nickname "Laptop" from Bill Parcells because of his fondness for technology.  Currently Troy manages an amazing group of teammates at Under Armour.

Leonard Marshall: Leonard Allen Marshall Jr. (born October 22, 1961) is a former American football defensive lineman who played twelve seasons in the National Football League (NFL).  Selected 37th overall in the 1983 NFL Draft, he spent the first ten seasons of his career with the New York Giants where he accumulated 79.5 sacks, ranking him third in team history.  He was twice selected to the Pro Bowl and twice named NFL Defensive Lineman of the Year following the 1985 and 1986 seasons.  He won two championships with the Giants, recording three sacks in the two Super Bowl games which he played in.  Marshall is most famously known for his 1991 hit on Joe Montana that knocked him out of the NFC championship game.  After his time with the Giants, Marshall went on to play a season each for the New York Jets and Washington Redskins, then retired from football at the age of 33.  He played college football at Louisiana State University.

Garry Howe: Garry William Howe Jr. (born June 20, 1968) is a former American professional football player who was a defensive lineman in the National Football League (NFL) and the World League of American Football (WLAF).  He played for the Pittsburgh Steelers, Cincinnati Bengals and Indianapolis Colts of the NFL, and the Frankfurt Galaxy and Amsterdam Admirals of the WLAF.  He also played fullback for the Iowa Barnstormers as well as defensive lineman from 1995 to 2000.  Howe played collegiately at Drake University and the University of Colorado.

Glen Condren: Glen Paige Condren (born June 10, 1942) is a former American football defensive lineman in the National Football League.  He played college football for the Oklahoma Sooners.  Condren was selected in both the 1964 NFL Draft (by the New York Giants in the 11th round (152nd overall)) and the 1964 American Football League Draft (by the New York Jets in the 19th round (147th overall)).  He played seven seasons for the NFL's New York Giants (1965–1967) and the Atlanta Falcons (1969–1972).  Glen also played minor league football with the (Huntsville) Alabama Hawks of the Continental Football League.  Married to Sheila Condren.

Supporting paragraphs: Troy Barnett Under Armour
Answer: Baltimore, Maryland