Question: The Professional Basketball Club LLC is an investment group headed by who, which American businessman and chairman of the Professional Basketball Club LLC, the ownership group of the Oklahoma City Thunder, an NBA franchise formerly known as the Seattle SuperSonics?

full_context: Document 1: Pete Babcock: Pete Babcock is a retired NBA executive, serving as general manager with three franchises; the San Diego Clippers, Denver Nuggets and Atlanta Hawks. He also worked in a variety of capacities from scouting to coaching to player personnel with the New Orleans Jazz, Los Angeles Lakers, Milwaukee Bucks, Toronto Raptors and Cleveland Cavaliers over a 42-year period. He also served as president and minority owner in his final two seasons with the Denver Nuggets. His Nuggets and Hawks teams appeared in the playoffs 14 out of 15 seasons. Babcock also directed the NBA Pre Draft Camp for over twenty years, served on the competition and rules committee and steering committee for the NBA and was a member of the USA basketball men's selection committee picking the 1996 Olympic team and head coach.
Document 2: Clark Hunt: Clark Knobel Hunt (born February 19, 1965) is Chairman, CEO, and part owner of the National Football League's Kansas City Chiefs and a founding investor-owner in Major League Soccer. Hunt also serves as chairman of Hunt Sports Group, where he oversees the operations of FC Dallas and, formerly, the Columbus Crew of MLS. He is the son of Lamar Hunt and the grandson of oil tycoon H.L. Hunt. Following the death of his father Lamar Hunt in 2006, Hunt co-inherited ownership of the Kansas City Chiefs. Clark serves as the ultimate authority as Chairman and CEO.
Document 3: Donald Sterling: Donald T. Sterling (born Donald Tokowitz; April 26, 1934) is a Jewish-American businessman. He was the owner of the Los Angeles Clippers professional basketball franchise of the National Basketball Association (NBA) from 1981 to 2014.
Document 4: List of Seattle SuperSonics seasons: The Seattle SuperSonics (commonly known as the Sonics) were an American professional basketball team based in Seattle, Washington. They played in the Pacific and Northwest Divisions of the National Basketball Association (NBA) from 1967 until 2008. After the 2007–08 season ended, the team relocated to Oklahoma City, Oklahoma, and now plays as the Oklahoma City Thunder.
Document 5: D.C. United Holdings: D.C. United Holdings is the holding company that controls operating rights to D.C. United, a professional soccer club that is part of Major League Soccer (MLS). The company, founded in 2007, was initially led by William H.C. Chang (chairman of Westlake International Group), Brian Davis and Christian Laettner (co-managers of Blue Devil Ventures), and Kevin Payne (president of D.C. United) who maintained his position with the new investors. At the time of formation, D.C. United Holdings was also interested in adding Discovery Communications founder John Hendricks, also the founder of the now-defunct Women's United Soccer Association, to the "majority-minority" group. Brian Davis and former owner Victor MacFarlane were the first African-American owners in MLS; William H.C. Chang is the first Asian-American. D.C. United Holdings bought D.C. United from Anschutz Entertainment Group for $33 million, a record fee for operational rights to an MLS club. The group is pursuing a soccer-specific stadium for D.C. United in the Washington area.
Document 6: Seattle Storm: The Seattle Storm are a professional basketball team based in Seattle, Washington, playing in the Western Conference in the Women's National Basketball Association (WNBA). The team was founded before the 2000 season began. The team is owned by Force 10 Hoops LLC, which is composed of three Seattle businesswomen: Dawn Trudeau, Lisa Brummel, and Ginny Gilder.
Document 7: Seattle SuperSonics: The Seattle SuperSonics, commonly known as the Sonics, were an American professional basketball team based in Seattle, Washington. The SuperSonics played in the National Basketball Association (NBA) as a member club of the league's Western Conference Pacific and Northwest divisions from 1967 until 2008. After the 2007–08 season ended, the team relocated to Oklahoma City, Oklahoma, and now plays as the Oklahoma City Thunder.
Document 8: List of Oklahoma City Thunder seasons: The Oklahoma City Thunder are a professional basketball team based in Oklahoma City, Oklahoma. They play in the National Basketball Association (NBA) and are a member of the NBA Western Conference's Northwest Division. The Thunder were founded in 1967 as the Seattle SuperSonics as one of two franchises that joined the NBA in the 1967–68 season. The SuperSonics moved to Oklahoma City after the 2007–08 season. The move from Seattle to Oklahoma City marks only the second time that a current franchise won a title in one city and moved some time afterwards to another city (the 2nd are the Atlanta Hawks who left St. Louis after winning the 1958 title there).
Document 9: Chesapeake Energy Arena: Chesapeake Energy Arena, originally known as the Ford Center from 2002 to 2010 and Oklahoma City Arena until 2011, is an arena located in downtown Oklahoma City, Oklahoma, United States. It opened in 2002 and since 2008 has served as the home venue of the Oklahoma City Thunder of the National Basketball Association (NBA). Previously, Chesapeake Energy Arena was home to the Oklahoma City Blazers of the Central Hockey League (CHL) from 2002 until the team folded in July 2009, and the Oklahoma City Yard Dawgz of AF2 from 2004 to 2009 when the team moved to the Cox Convention Center. In addition to its use as a sports venue, Chesapeake Energy Arena hosts concerts, family and social events, conventions, ice shows, and civic events. The arena is owned by the city and operated by the SMG property management company and has 18,203 seats in the basketball configuration, 15,152 for hockey, and can seat up to 16,591 for concerts.
Document 10: List of Oklahoma City Thunder head coaches: The Oklahoma City Thunder is an American professional basketball franchise based in Oklahoma City, Oklahoma. It plays in the Northwest Division of the Western Conference in the National Basketball Association (NBA). It was known as the Seattle SuperSonics from 1967 to 2008. The team plays its home games at the Chesapeake Energy Arena. As of October 2008, the Thunder is currently owned by Professional Basketball Club LLC and coached by Billy Donovan, with Sam Presti as its general manager. The team was formed in 1967. After spending 41 seasons in Seattle, Washington, the SuperSonics moved to Oklahoma City. Owner Clay Bennett, who purchased the team in 2006, sought to get public funding for a new arena in Seattle, or a major renovation of the KeyArena in 2007. After failing to do so, he decided to move the team to Oklahoma City. Seattle sued Bennett's group to enforce the lease that required the team to stay until 2010. The two sides reached a $45 million settlement to pay off the team's lease with KeyArena in July 2008.
Document 11: Seattle SuperSonics all-time roster: The Seattle SuperSonics were an American professional basketball team based in Seattle, Washington. They played in the Western, Pacific and Northwest divisions of the Western Conference in the National Basketball Association (NBA). The team joined the NBA in 1967 as an expansion team, and won their first and only NBA Championship out of 22 playoffs appearances in the 1979 NBA Finals. The SuperSonics played their home games mainly at the Seattle Center Coliseum, the Kingdome during eight seasons, and the Tacoma Dome for one season while the Coliseum was being remodeled and later renamed KeyArena.
Document 12: Professional Basketball Club: The Professional Basketball Club LLC is an investment group headed by Clay Bennett that owns the National Basketball Association (NBA)'s Oklahoma City Thunder franchise (formerly the Seattle SuperSonics) and the Thunder's NBA Development League affiliate Oklahoma City Blue. The group also owned the Women's National Basketball Association (WNBA)'s Seattle Storm franchise from 2006 to 2008. The PBC then sold the Storm to local Seattle owners, before moving the SuperSonics to Oklahoma City.
Document 13: Seattle SuperSonics relocation to Oklahoma City: The Seattle SuperSonics relocation to Oklahoma City was a successful effort by the ownership group of the Seattle SuperSonics to relocate the team from Seattle, Washington to Oklahoma City, Oklahoma. The team began play as the Oklahoma City Thunder in the 2008–09 basketball season, after becoming the third National Basketball Association (NBA) franchise to relocate in the 2000s.
Document 14: Oklahoma Thunder: The Oklahoma Thunder are an American football team based in Tulsa, Oklahoma. Starting with the 2011 season, the team competes in the Gridiron Developmental Football League, playing in the Midwest-North Division in the GDFL's Impact Conference. Players have included Bacone College alumni, former major college standouts, and former NFL players including Willie Ponder. The team was founded by Bruce Madden, Daniel Cornelison, and Gary Joice in 2007. James Ashford later bought a piece of the team. The team originally competed in the World Football League. The league was formed as a minor league for players to work on their skills in hopes of making a professional team. During the team's time in the WFL the Thunder had players signed by several professional teams including the New Orleans Voo-Doo and the Colorado Crush of the AFL The team's name pre-dates the relocation of the Seattle SuperSonics to Oklahoma City to become the Oklahoma City Thunder. The team's official colors are silver and blue. The team's cheerleaders are known as the Thunder Girls.
Document 15: Clay Bennett (businessman): Clayton Ike Bennett (born 1959) is an American businessman and chairman of the Professional Basketball Club LLC, the ownership group of the Oklahoma City Thunder, an NBA franchise formerly known as the Seattle SuperSonics. Bennett is the chairman of Oklahoma City-based Dorchester Capital Corporation, as well as the chairman emeritus of the board of directors of the Oklahoma Heritage Association and chairman of the Board of Regents of the University of Oklahoma.
ground_truth: Clayton Ike Bennett