Isaiah Hartenstein (born May 5, 1998) is a German American professional basketball player for the New York Knicks of the National Basketball Association (NBA).
Born in Eugene, Oregon, Hartenstein is the son of Florian, a German basketball coach and former professional basketball player of mixed heritage.
His mother is American.
His parents met in the United States when his father attended the University of Oregon.
2008
In 2008, Hartenstein and his family moved to Germany, where his father was playing professionally.
2009
Hartenstein joined the MTV Gießen youth ranks and continued his career at the youth teams of QTSV Quakenbrück/Artland Dragons, after his father had signed to play with the Artland Dragons in 2009.
2013
In the 2013–14 season, Hartenstein led the Artland Dragons' junior team to a German championship in the Under-16 Bundesliga JBBL, while being named Most Valuable Player.
He averaged 20.9 points, 12.1 rebounds, 3.4 assists, 2.9 steals and 1.9 blocks on the season.
His Father Florian who served as head coach of the team was named JBBL Coach of the Year.
2014
Hartenstein was selected to play in the 2014 Jordan Brand Classic International Game: He finished the game with four points and five rebounds in 18 minutes.
Hartenstein helped the Žalgiris Kaunas Under-18 squad to win the qualifying tournament to the Euroleague Basketball Next Generation Tournament and was selected MVP.
Hartenstein represented Germany at the 2014 FIBA Europe Under-16 Championship and the 2015 FIBA Europe Under-18 Championship.
2015
On February 1, 2015, Hartenstein made his debut in Germany's top-tier level Basketball Bundesliga, seeing 1:12 minutes of action against Eisbären Bremerhaven.
In August 2015, Hartenstein signed a deal with Lithuanian powerhouse Žalgiris Kaunas, but he remained with the Artland Dragons on loan.
The Dragons had withdrawn from the Bundesliga, and were relegated to the 2. Bundesliga ProB, Germany's third division.
Hartenstein played in 14 games for the Quakenbrück based side during the 2015–16 campaign, compiling averages of 11.6 points, 8.9 rebounds, 2.1 blocks, 1.6 steals and 1.4 assists.
2016
In January 2016, Hartenstein decided to leave the Artland Dragons to join Žalgiris Kaunas.
Hartenstein made his debut for Žalgiris in Lithuania's top-flight league, the LKL, on September 28, 2016 against Šiauliai and in the EuroLeague against Fenerbahce on October 26.
Later in that season, he helped Žalgiris win their first ever King Mindaugas Cup.
In February 2016, Hartenstein attended the "Basketball Without Borders Global Camp" during the NBA All-Star Weekend in Toronto, Canada.
He helped carry Germany to a fourth-place finish at the 2016 FIBA Europe Under-18 Championship, averaging team-highs of 14.7 points, 9.5 rebounds, 1.7 blocks, and 1.7 steals a contest, which earned him a spot in the tournament's "All-Star Five".
2017
On April 7, 2017, he scored 10 points and grabbed three rebounds in 19 minutes of play at the Nike Hoop Summit.
Hartenstein declared for the 2017 NBA draft on April 22, 2017.
He was also named an invite for the 2017 NBA Draft Combine, but he ultimately declined participation for the event.
On June 22, 2017, he was selected with the 43rd overall pick in the 2017 NBA draft by the Houston Rockets and subsequently competed for the team in the 2017 NBA Summer League.
In the 2017–18 campaign, Hartenstein appeared in 38 games of the NBA G League, averaging 9.5 points and 6.6 rebounds a contest for the Rio Grande Valley Vipers.
In August 2017, he made his debut with the German men's national team and took part in EuroBasket 2017, averaging 4.3 points and 2.5 rebounds per game.
2018
On July 25, 2018, the Houston Rockets signed Hartenstein.
In the 2018–19 season, Hartenstein scored 33 points and made a career-high 8 3-pointers in the series-clinching game as they won the NBA G League championship with the Rio Grande Valley Vipers.
He won the NBA G League Finals MVP award.
2019
After being sent down to the Rio Grande Valley Vipers, he was suspended one game without pay after leaving the bench during an altercation in a 132–109 loss to the Memphis Hustle on December 17, 2019.
On February 7, 2019, Hartenstein recorded his first career triple-double after posting 12 points, 16 rebounds and 11 assists in a 103–102 road win against Salt Lake City Stars.
2020
On June 23, 2020, the Houston Rockets announced that they had waived Hartenstein.
On November 30, 2020, the Denver Nuggets announced that they had signed Hartenstein to a multi–year contract.
Playing behind the All-Star center Nikola Jokic, Hartenstein averaged 9 minutes, 3.5 points and 2.8 rebounds per game.
On March 25, 2021, Hartenstein and two future second-round picks were traded to the Cleveland Cavaliers in exchange for center JaVale McGee.
In his first twelve games with the Cavs, Hartenstein averaged 19 minutes of playing time and 9 points, 7 rebounds, 2.6 assists and 1.4 blocks per game.
On September 27, 2021, Hartenstein signed with the Los Angeles Clippers.
On July 12, 2022, Hartenstein signed a two-year, $16 million contract with the New York Knicks.
