[3] Criticized for his on-court conduct and physically aggressive play,[4] he has the second-most career ejections of any NBA player, behind only Rasheed Wallace.

As a junior in 2006–07, he averaged 25 points, 13 rebounds, three assists and three steals per game as he led Saginaw to the Class A State Championship and a 26–1 record.

[7] As a senior in 2007–08, Green averaged 20 points, 13 rebounds, and two blocked shots per game in leading the Saginaw High Trojans to a 27–1 record, a No.

He became the first player in Michigan State history to be named Big Ten Sixth Man of the Year, winning the award by unanimous vote.

He also earned third-team All-Big Ten honors and was the recipient of MSU's Most Improved Player, Chairman of the Boards and Antonio Smith Glue and Guts awards.

On February 10, 2011, Green followed Charlie Bell and Magic Johnson to be the third Michigan State men's basketball player to record a triple-double.

The 2011–12 squad compiled a regular season 24–7 record and a 13–5 mark in Big Ten play, good for the team's 13th conference title and the third in the previous four years.

[15] In his NBA debut in the Warriors' season opener on October 31 against the Phoenix Suns, Green played one minute, made one defensive rebound, and committed one foul.

[16] Green gradually received more playing time in subsequent games, especially in the wake of injuries to Brandon Rush and Richard Jefferson.

[29] On April 14, 2014, in the Warriors' second to last game of the regular season, Green recorded a career-high 20 points and a career-high-tying 12 rebounds off the bench to help his team defeat the Minnesota Timberwolves, 130–120.

[38][39] Green helped the Warriors record their first ever 10–0 start to a season behind averages of 11.9 points, 7.7 rebounds, a team-high 6.6 assists, 1.2 steals and 1.2 blocks per game.

[49] Three days later, in a win over the Utah Jazz, Green became the first player in NBA history to record 1,000 points, 500 rebounds, 500 assists, 100 steals and 100 blocks in a season.

In Game 2 of the NBA Finals against the Cleveland Cavaliers, Green had 28 points with five three-pointers, seven rebounds and five assists to lead the Warriors to a 110–77 win and a 2–0 advantage in the series.

[62] He helped the Warriors start the season 14–2 before a left ankle injury sidelined him for the team's November 26 game against the Minnesota Timberwolves.

[66] On January 16, he recorded his third triple-double of the season with 11 points, 13 rebounds and 11 assists, while also equaling his career best with five blocks, in a 126–91 win over the Cleveland Cavaliers.

On April 16, 2017, Green had 19 points, 12 rebounds, nine assists, five blocked shots and three steals in a 121–109 win over the Portland Trail Blazers in Game 1 of their first-round playoff series.

[74] The Warriors went on to sweep both the first and second rounds of the playoffs, as Green posted his third career postseason triple-double with 17 points, 10 rebounds and 11 assists in Game 4 of their second-round series against the Utah Jazz.

[77] In the Warriors' season opener against the Houston Rockets on October 17, 2017, Green exited in the second half with a strained left knee after he contributed nine points, 13 assists and 11 rebounds.

[81] On January 4, 2018, in a 124–114 win over the Houston Rockets, Green recorded 17 points, 14 rebounds and 10 assists to become the franchise career leader in triple-doubles with 21, passing Tom Gola.

[84] On February 24, 2018, in a 112–80 win over the Oklahoma City Thunder, Green passed Chris Mullin (488) for eighth place on the Warriors' blocked shots list.

[87] In Game 1 of the Warriors' second-round series against the New Orleans Pelicans, Green recorded his fourth career postseason triple-double with 16 points, 15 rebounds, 11 assists, three steals and two blocks in a 123–101 win.

Speaking as an analyst on TNT's pregame show before the game between the Orlando Magic and the Philadelphia 76ers on August 7, he stated that he wanted Devin Booker "out of Phoenix", adding that it was not good for him and his career.

[153] Green represented the United States national team at the 2011 Summer Universiade men's basketball tournament in Shenzhen, China.

[29][157][158] Green studies opponents' habits, and leverages his preparation along with his muscular frame and lower-body strength, and is capable of generating rebounds, steals and blocks.

[158][159] Under the coaching of Steve Kerr (and Luke Walton under a temporary basis), Green became crucial to the Warriors' Death Lineup as the team's center.

On the offensive side, however, he can outrun, out-pass and outmaneuver most other centers in the league, leading to fast-break opportunities and disrupting defensive sets.

Green's ball handling, court vision and unselfishness in a point forward role have been repeatedly cited as a reason why the Warriors improved from 2014–15 to 2015–16.

[168] He is widely viewed as the emotional and motivational "heart and soul" of the Warriors[17][169] and is noted for his vocal leadership on the court and in the locker room.

[181] In January 2022, he signed a multiyear deal to be an analyst and contributor with Turner Sports, which includes making in-season appearances on Inside the NBA.

The arresting officers stated that Green had a blood alcohol level of .10 and admitted to slapping Edmondson and asked to apologize to the victim.