Question: Who, in 1978, acquired ownership of the NBA team that plays their home games at TD Garden?

Context paragraphs:
List of Boston Celtics head coaches: The Boston Celtics are an American professional basketball team based in Boston, Massachusetts.  They play in the Atlantic Division of the Eastern Conference in the National Basketball Association (NBA).  The team is owned by Wycliffe Grousbeck and coached by Brad Stevens, with Danny Ainge as the general manager.  Founded in 1946, their 17 NBA Championships are the most for any NBA franchise, and their eight consecutive NBA championships from 1959 to 1966 represent the longest consecutive championship winning streak of any North American professional sports team to date.  They play their home games in the TD Garden.

List of Boston Bruins head coaches: The Boston Bruins, a professional ice hockey team based in Boston, Massachusetts, has had 27 head coaches in its team history.  The franchise is a member of the Atlantic Division of the Eastern Conference of the National Hockey League (NHL).  The franchise was founded in 1924 and entered the NHL as the first American-based expansion team, playing its initial seasons at the still-active Boston Arena.  It is an Original Six team, along with the Toronto Maple Leafs, Detroit Red Wings, New York Rangers, Montreal Canadiens and Chicago Blackhawks.  Its home arena is the 17,565-person capacity TD Garden, where it has played since 1995, after leaving the Boston Garden.

2014–15 Providence Friars men's ice hockey season: The 2014–15 Providence Friars men's ice hockey team represents Providence College in the 2014–15 NCAA Division I men's ice hockey season.  The team is coached by Nate Leaman, in his 4th season with the Friars.  The Friars play their home games at Schneider Arena on campus in Providence, Rhode Island, competing in Hockey East.  On April 11, 2015, the Friars defeated the Boston University Terriers 4–3 at TD Garden to win their first National Championship in school history.

Buffalo Braves: The Buffalo Braves were an American professional basketball franchise based in Buffalo, New York.  The Braves competed in the National Basketball Association (NBA) as a member club of the league's Eastern Conference Atlantic Division from 1970 until 1978.  In 1978, Braves owner John Y. Brown, Jr. swapped franchises with then-Boston Celtics owner Irv Levin, who then moved the team to San Diego, where it was renamed the San Diego Clippers.  The franchise moved to Los Angeles in 1984, and is now known as the Los Angeles Clippers.

Portland Trail Blazers: The Portland Trail Blazers, commonly known as the Blazers, are an American professional basketball team based in Portland, Oregon.  The Trail Blazers compete in the National Basketball Association (NBA) as a member club of the league's Western Conference Northwest Division.  The team played its home games in the Memorial Coliseum before moving to Moda Center in 1995 (called the Rose Garden until 2013).  The franchise entered the league as an expansion team in 1970, and has enjoyed a strong following: from 1977 through 1995, the team sold out 814 consecutive home games, the longest such streak in American major professional sports at the time, and only since surpassed by the Boston Red Sox.  The Trail Blazers have been the only NBA team based in the bi-national Pacific Northwest, after the Vancouver Grizzlies relocated to Memphis and became the Memphis Grizzlies in 2001, and the Seattle SuperSonics relocated to Oklahoma City and became the Oklahoma City Thunder in 2008.

KDrew: Kevin Nicholas Drew, professionally and better known as KDrew, is an artist, producer and DJ from New Jersey.  KDrew produces primarily EDM and is perhaps best known for his remixes for Zedd and Lady Gaga, although his original records "Bullseye" and Circles have generated millions of plays online.  The Boston Celtics of the NBA currently use "Circles" as the intro music for their home games at TD Garden.  KDrew has also done official remixes for Nelly Furtado, Adventure Club, T.I. and others and collaborated with Taryn Manning on "Summer Ashes", which was released on July 23, 2013.  On February 5, 2015 MTV premiered KDrew's music video for "Let Me Go".  KDrew performed at Global Dance Festival at Red Rocks Amphitheatre.  He co-wrote the song "I Want You to Know", by Zedd featuring Selena Gomez, alongside Zedd and Ryan Tedder.  KDrew also features as an additional producer on the tracks "Done With Love" and "Straight Into the Fire" off Zedd's "True Colors" album.  KDrew co-produced two songs on Hilary Duff's Breathe In.  Breathe Out.  album, "Confetti" and "Arms Around a Memory".

Raptors 905: Raptors 905 are a Canadian professional basketball team in the NBA G League.  The team is based in Mississauga, Ontario, and began play in the 2015–16 season.  The club, which is the G League affiliate of the Toronto Raptors of the National Basketball Association, plays their home games at the Hershey Centre, replacing the Centre's former basketball tenant, the Mississauga Power of the National Basketball League of Canada.  The team also plays occasional home games at the Air Canada Centre, the home of their parent club.  Raptors 905 were the eighth D-League team to be owned by an NBA team and the first to be based outside the United States.

Boston Celtics: The Boston Celtics are an American professional basketball team based in Boston, Massachusetts.  The Celtics compete in the National Basketball Association (NBA) as a member of the league's Eastern Conference Atlantic Division.  Founded in 1946 and one of eight NBA teams (out of 23 total teams) to survive the league's first decade, the team is owned by Boston Basketball Partners LLC.  The Celtics play their home games at the TD Garden, which they share with the National Hockey League (NHL)'s Boston Bruins.  The franchise's 17 championships are the most of any NBA team, and account for 24.3 percent of all NBA championships since the league's founding in 1946.  As a percentage of championships won, the Celtics are the most successful franchise to date in the major four traditional North American professional sports leagues.

Portland Trail Blazers all-time roster: The Portland Trail Blazers, commonly known as the Blazers, are an American professional basketball team based in Portland, Oregon.  They play in the Northwest Division of the Western Conference in the National Basketball Association (NBA).  The Trail Blazers originally played their home games in the Memorial Coliseum, before moving to the Rose Garden in 1995.  The franchise entered the league in 1970, and Portland has been its only home city.  The franchise has enjoyed a strong following; from 1977 through 1995, the team sold out 814 consecutive home games, the longest such streak in American major professional sports.  The Trail Blazers are the only team in the major professional North American sports leagues located in the state of Oregon.  The Trail Blazers are also currently the only NBA team based in the binational Pacific Northwest, after the Vancouver Grizzlies relocated to Memphis and became the Memphis Grizzlies in 2001, and the Seattle SuperSonics relocated to Oklahoma City and became the Oklahoma City Thunder in 2008.

List of Boston Bruins general managers: The Boston Bruins, a professional ice hockey team based in Boston, Massachusetts, has had eight general managers in its team history.  The franchise is a member of the Atlantic Division of the Eastern Conference of the National Hockey League (NHL).  The franchise was founded in 1924 and entered the NHL as the first American-based expansion team, playing its initial seasons at the still-active Boston Arena.  It is an Original Six team, along with the Toronto Maple Leafs, Detroit Red Wings, New York Rangers, Montreal Canadiens and Chicago Blackhawks.  Its home arena is the 17,565-person capacity TD Garden, where it has played since 1995, after leaving the Boston Garden.

Supporting paragraphs: Buffalo Braves Boston Celtics
Answer: John Y. Brown, Jr.