Question: What job does the man traded midseason in the 2011–12 Los Angeles Lakers to the Cleveland Cavaliers have with the Lakers?

Context paragraphs:
Los Angeles Lakers all-time roster: The Los Angeles Lakers are an American professional basketball team based in Los Angeles, California.  They play in the Pacific Division of the Western Conference in the National Basketball Association (NBA).  The Lakers' franchise was founded in 1947 in Detroit, Michigan before moving to Minneapolis, Minnesota, where the team got its official title from the state's nickname, "Land of 10,000 Lakes".  The Minneapolis Lakers won five NBA Finals before relocating to Los Angeles in the 1960–61 NBA season, becoming the first West Coast team in league history.  In the 1960s, the Lakers reached the NBA Finals six times, but lost every series to the Boston Celtics, beginning their long and storied rivalry.  In 1972, with future Hall of Famers Wilt Chamberlain, Gail Goodrich, and Jerry West, the Lakers compiled a 33-game winning streak, the longest streak in U.S. professional team sports, and won their sixth title under coach Bill Sharman.  The Lakers' popularity soared in the 1980s when they won five additional championships during a nine-year span with the help of Hall of Famers Magic Johnson, Kareem Abdul-Jabbar, James Worthy and coach Pat Riley, the franchise's all-time leader in both regular season and playoff games coached and wins.  Two of those championships during that span were against their arch-rivals, the Boston Celtics.  With the team of Shaquille O'Neal, Kobe Bryant, Toby Tincher, and Hall of Fame coach Phil Jackson, the Lakers played in four of the first five NBA Finals of the 21st century; winning three consecutively from 2000 to 2002, and losing the fourth in 2004.  The Lakers would then conclude the decade with three straight Finals appearances; losing to the Boston Celtics in 2008 but then prevailing with back-to-back championships against the Orlando Magic in 2009 and the Boston Celtics in 2010.  The 2010 championship marks the 16th NBA championship in Lakers franchise history.

2011 NBA All-Star Game: The 2011 NBA All-Star Game was an exhibition basketball game that was played on February 20, 2011 at Staples Center in Los Angeles, California, home of the Los Angeles Clippers and the Los Angeles Lakers.  This game was the 60th edition of the National Basketball Association (NBA) All-Star Game and was played during the 2010–11 NBA season.  The Los Angeles Clippers and Los Angeles Lakers served as the hosts.  The Clippers and Lakers were both awarded the All-Star Game in an announcement by commissioner David Stern on June 9, 2009.  This was the second time that the Staples Center had hosted the All-Star Game; the arena had previously hosted the event in 2004.  This will be the fifth time that Los Angeles had hosted the All-Star Game; before Staples Center opened in 1999, the city had previously hosted the event in 1963, 1972, and 1983.  Rihanna, Kanye West and Drake were the halftime performers, while Keri Hilson, Lenny Kravitz and Bruno Mars were the entertainment for pre-show festivities.

2011–12 Los Angeles Lakers season: The 2011–12 Los Angeles Lakers season is the 64th season of the franchise, its 63rd season in the National Basketball Association (NBA), and its 52nd season in Los Angeles.  Following the 2011 NBA lockout each team only played 66 games instead of the usual 82.  At midseason they traded longtime point guard Derek Fisher to the Houston Rockets for Jordan Hill and longtime forward Luke Walton to the Cleveland Cavaliers for Ramon Sessions.  The Lakers finished 41–25, winning the Pacific Division for the 33rd time.  They finished the season as the #3 seed in the Western Conference.  In the playoffs, they lost to the Oklahoma City Thunder 1–4 in the Western Conference semi-finals.  This season marked Kobe Bryant's final career playoff appearance.

Bernie Bickerstaff: Bernard Tyrone Bickerstaff (born February 11, 1944) is an American basketball coach.  He previously worked as the head coach for the NBA's Seattle SuperSonics, Denver Nuggets, Washington Bullets/Wizards, Charlotte Bobcats, and Los Angeles Lakers.  He has also been an assistant for the Portland Trail Blazers, Chicago Bulls, Los Angeles Lakers, and Cleveland Cavaliers.  He has served in numerous other NBA front office positions, and has been a consultant for the Harlem Globetrotters.

List of career achievements by Kobe Bryant: Kobe Bryant is an American retired shooting guard who played for the Los Angeles Lakers of the National Basketball Association (NBA) for his entire 20-year career.  Bryant is the only son of former Philadelphia 76ers player and former Los Angeles Sparks head coach Joe Bryant.  Selected 13th overall by the Charlotte Hornets in the 1996 NBA draft, Bryant was traded to the Los Angeles Lakers for Vlade Divac a month later.  He and then-teammate Shaquille O'Neal led the Lakers to three consecutive NBA championships from 2000 to 2002.  After O'Neal was traded to the Miami Heat following the 2003–04 season, Bryant became the cornerstone of the Lakers franchise.  He led the NBA in scoring during the and seasons.  In 2006, Bryant scored a career-high 81 points against the Toronto Raptors, the second-highest number of points scored in a game in NBA history, behind only Wilt Chamberlain's 100 point performance.  Bryant was awarded the regular season's Most Valuable Player Award (MVP) in the 2007–08 season and led his team to the 2008 NBA Finals as the first seed in the Western Conference.  In the 2008 Summer Olympics, he won a gold medal as a member of the U.S. men's basketball team, occasionally referred to as "The Redeem Team".  He led the Lakers to two more championships in 2009 and 2010, winning the Finals MVP award on both occasions.

2015–16 Los Angeles Lakers season: The 2015–16 Los Angeles Lakers season was the franchise's 68th season, its 67th season in the National Basketball Association (NBA), and its 56th in Los Angeles.  The Lakers looked to rebound following its worst season in franchise history in 2014–15.  Unfortunately, the Lakers would finish with a franchise-worst 17–65 record.  Jordan Hill, Jeremy Lin, Wesley Johnson, Wayne Ellington, Carlos Boozer, Ronnie Price and Ed Davis all departed respectively.  The Lakers drafted D'Angelo Russell, Larry Nance, Jr., and Anthony Brown in the 2015 NBA Draft.  Afterwards, the Lakers traded for former Pacers' center Roy Hibbert and signed for the reigning Sixth Man of the Year, Lou Williams, and forward Brandon Bass.  Former Lakers forward, Metta World Peace, was brought back to the team as well after the Lakers amnestied him in 2013.  This was Kobe Bryant's final season with the team and in the NBA after he announced his retirement.

List of Los Angeles Lakers seasons: The Los Angeles Lakers are a professional basketball team based in Los Angeles, California that competes in the National Basketball Association (NBA), which was formerly called the Basketball Association of America (BAA).  Since 1999, the Lakers have played their home games at Staples Center.  The Lakers' franchise was founded in 1947 in Minneapolis, Minnesota.  The first owners purchased the disbanded Gems from Detroit, Michigan, then renamed and moved the team.  It was in Minneapolis where the Lakers received their official title from Minnesota's nickname, Land of 10,000 Lakes.  The Lakers won five championships before relocating to Los Angeles for the 1960–61 NBA season.  The Lakers went on to lose all of their eight appearances in the NBA Finals in the 1960s, despite the presence of Elgin Baylor and Jerry West.  In , the Lakers compiled a 33-game winning streak, the longest streak in U.S. professional team sports, and won their sixth title, under coach Bill Sharman.  The Lakers' popularity soared in the 1980s when they won five additional championships during a nine-year span with the help of Hall of Famers Magic Johnson, Kareem Abdul-Jabbar, James Worthy and coach Pat Riley, the franchise's all-time leader in both regular season and playoff games coached and wins.  Two of those championships during that span were against their arch-rivals, the Boston Celtics.  With the help of Shaquille O'Neal, Kobe Bryant, and Hall of Fame coach Phil Jackson, the Lakers played in seven NBA Finals between 2000 and 2010, winning three of them consecutively from 2000 to 2002, losing the next two in 2004 and 2008, and winning in 2009 and 2010; the last three appearances were without O'Neal.

Luke Walton: Luke Theodore Walton (born March 28, 1980) is an American former professional basketball player and the current head coach of the Los Angeles Lakers.  He played 10 seasons in the NBA as a forward, and won two NBA championships with the Lakers and won one with the Golden State Warriors as an assistant coach.

2000–01 Atlanta Hawks season: The 2000–01 NBA season was the Hawks' 52nd season in the National Basketball Association, and 33rd season in Atlanta.  Under new head coach Lon Kruger, the Hawks got off to a bad start losing their first seven games, but then posted a 7–7 record in December.  In January, they traded Jim Jackson to the Cleveland Cavaliers for Brevin Knight.  After playing in the 2001 NBA All-Star Game, Dikembe Mutombo was traded at midseason along with Roshown McLeod to the Philadelphia 76ers for Theo Ratliff, Toni Kukoč and Nazr Mohammed.  However, Ratliff injured his shooting hand prior to the trade, and was out for the remainder of the season.  Mutombo would later on be named Defensive Player of the Year with the Sixers, who went on to lose in five games to the Los Angeles Lakers in the NBA Finals.

Lakers–Clippers rivalry: The Lakers–Clippers rivalry is a National Basketball Association (NBA) rivalry between the Los Angeles Lakers and Los Angeles Clippers.  The two Pacific Division teams both play their home games at Staples Center in Los Angeles, inspiring their matchups to sometimes be called the "Hallway Series".  The Lakers relocated from Minneapolis in 1960, while the Clippers moved from San Diego in 1984.  Los Angeles fans have historically favored the Lakers.  But the Clippers have sold out every home game at Staples Center since Feb. 2011 and entered the 2016–17 season with the sixth-longest active sellout streak in the NBA.  The Lakers have won 11 of their 16 NBA championships since moving to Los Angeles.  Meanwhile, the Clippers have made the playoffs only nine times since 1984 and were long considered the laughingstock of the NBA; in the history of the franchise, they have never advanced past the second round of the playoffs.  Some contended that the term "rivalry" was inaccurate until the Clippers became more successful.  For the first time in 20 years, the Clippers won the season series against the Lakers in 2012–13.  This was the first of five straight season series victories for the Clippers, which included season sweeps in both 2014-15 and 2015-16.  With the Clippers' 3-1 series win in 2016-17, the Lakers have now won the season series just four times in the past 13 seasons, with five Clippers wins, four Lakers wins, and four ties.  The Lakers hold a 99–47 advantage in the all-time series against the Clippers.  The two teams have never met in the playoffs.

Supporting paragraphs: 2011–12 Los Angeles Lakers season Luke Walton
Answer: head coach