Question: Who played Lieutenant Matt Kowalski?
About the article "Gravity (film)", section "Cast".

Candidate passages:
Gary Kowalski was a professional American football player who played offensive lineman for six seasons for the Los Angeles Rams and San Diego Chargers. 
  Stanley and Stella Kowalski – character in the Pulitzer Prize-winning play by Tennessee Williams and 1951 film, "A Streetcar Named Desire"  Leon Kowalski – character in the 1982 film "Blade Runner" played by Brion James  Peter "Petey" Kowalski in the video game "Bully" Viktor Kowalski, member of the OAS in "The Day of the Jackal" by Frederick Forsyth  Detective Stanley Raymond Kowalski – character in the Gemini Award-winning television series "Due South" (named after the above "Streetcar" character)  Matt Kowalsky – George Clooney's character in the movie Gravity.
Kowalski – The Top Gun pilot in 1991 film "Hot Shots!
", by Kristy Swanson  Sophie Kowalski – Marion Cotillard's character in the 2005 French film "Jeux d'Enfants", also known by its English title, "Love Me If You Dare" Sergei Kowalski, the titular character in the spaghetti western "The Mercenary", played by Franco Nero.
"Kowalski" – song by British dance/rock band Primal Scream  Baby Kowalski – Supporting character in "the Ren & Stimpy Show"  Major Charles Kawalsky – character in the popular science fiction television series "Stargate SG-1"  Kitty Kowalski – Lex Luthor's companion in 2006 film "Superman Returns", by Parker Posey  Kowalski – main character in "Vanishing Point" (1971 film), played by Barry Newman  Kowalski – on the "Seaview", the Submarine on the 1960s TV show "Voyage to the Bottom of the Sea" Benjamin "Ben" Kowalski in the Comic series "Templar, Arizona"  Kowalski – fictional character in the PlayStation 2 game "Syphon Filter 2"  Walt Kowalski, the protagonist, a traditional Korean War veteran in a changing world, in the 2008 film "Gran Torino" played by Clint Eastwood  Steve Kowalski – character in the 2007 film "Devil's Diary"  Sgt.
Kowalski – character in video game "Call of Duty 3"  Roxanne Kowalski – Daryl Hannah's character in Roxanne, the 1987 remake of Cyrano de Bergerac (play) with Steve Martin  Mr Kowalski – original owner of "Kowalski's", Rosie Duncan's florist store in the novel "Fairytale of New York" by Miranda Dickinson  Sgt.
Kowalski – Raising Arizona  Roch Kowalski – brave and stupid officer in Sienkiewicz's novel "With Fire and Sword"  Mrs. Kowalski – Miriam Margolyes' character in How to Lose Friends & Alienate People (film) (2008)  Dick Kowalsky – character in the French animated series "Funky Cops" (2003)  Kowalski – Penguin in "Madagascar" and the TV series "The Penguins of Madagascar"  Joe Kowalski – character in SIGMA Force book series from author James Rollins  
 Sandra Bullock as Dr. Ryan Stone, a medical engineer and mission specialist who is on her first space mission.
 George Clooney as Lieutenant Matt Kowalski; the commander of the team.
Kowalski is a veteran astronaut planning to retire after the "Explorer" expedition.
He enjoys telling stories about himself and joking with his team, and is determined to protect the lives of his fellow astronauts.
 Ed Harris (voice) as Mission Control in Houston, Texas.
 Orto Ignatiussen (voice) as Aningaaq, a Greenlandic Inuit fisherman who intercepts one of Stone's transmissions.
Aningaaq also appears in a self-titled short written and directed by "Gravity" co-writer Jonás Cuarón, which depicts the conversation between him and Stone from his perspective.
 Phaldut Sharma (voice) as Shariff Dasari, the flight engineer on board the "Explorer".
 Amy Warren (voice) as the captain of "Explorer".
 Basher Savage (voice) as the captain of the International Space Station.
Kowalski has played with numerous bands and performers; both as a member of the group and as a session musician.
Acts Kowalski has played with include: 
Bloom attended Peabody High School, where he earned three letters in football and basketball, two in track and field, and one in baseball.
He attended Camp Tevya in Brookline, New Hampshire in the early 1980'.
Bloom went on to attend the University of Pittsburgh, where he played football as an offensive tackle and an offensive guard.
Bloom graduated in 1996 with a degree in sign language.
After graduating, Bloom briefly played in the National Football League for the San Diego Chargers.
He then became a schoolteacher, teaching mathematics and English to children with behavioral problems and deaf children at Revere High School.
After rewarding his three most apt students with a trip to a professional wrestling event, Bloom, who as a child had aspired to wrestle professionally, met wrestler and wrestling trainer Killer Kowalski and expressed an interest in learning how to wrestle.
Kowalski invited Bloom to attend his school, and Bloom opted to leave teaching and train as a wrestler.