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?

Context paragraphs:
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).

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.

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.

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.

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.

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.

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.

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 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.

Hapoel Jerusalem B.C.: Hapoel Jerusalem Basketball Club (Hebrew: הפועל ירושלים‎ ‎ ), for sponsorships reasons Hapoel Bank Yahav Jerusalem, is the premier professional basketball club of the City of Jerusalem and competes in the EuroCup, Israeli Premier League, and the Israeli State Cup.  Hapoel has won several titles, including the ULEB Cup (now called EuroCup) in 2004, and the Israeli League championship in 2015, and 2017.  In 2013, a new ownership group headed by Ori Allon, took over, and the club has since seen a remarkable advancement and expansion.  The team began playing in the Jerusalem Arena in 2014.

Supporting paragraphs: Professional Basketball Club Clay Bennett (businessman)
Answer: Clayton Ike Bennett