Isaiah Hartenstein

Hartenstein is a 7-foot center who entered the NBA as the 43rd overall pick in the 2017 draft after developing through the German and Lithuanian club systems. He spent his first seasons with the Houston Rockets before moving through Denver, Cleveland, the Los Angeles Clippers, and the New York Knicks. In 2024, he signed with the Oklahoma City Thunder and captured his first NBA championship in 2025. He has also represented Germany internationally.

Born on May 5, 1998, in Eugene, Oregon, Hartenstein is the son of former professional player and coach Florian Hartenstein and Theresa Hartenstein. His mother is White American and his father is half African-American and half German. In 2008, the family relocated to Germany when Florian signed to play professionally there.

Hartenstein began his organized basketball in Germany with MTV Gießen before joining the youth ranks of QTSV Quakenbrück/Artland Dragons, where his father became head coach. In the 2013–14 season, he led the Artland Dragons' junior team to a German under-16 Bundesliga JBBL championship and was named MVP while his father earned JBBL Coach of the Year honors. He made his senior debut in Germany's top-tier Basketball Bundesliga at age 16 in February 2015.

In August 2015, Hartenstein signed with Lithuanian powerhouse Žalgiris Kaunas but remained on loan with Artland Dragons, which had been relegated to the third division. He averaged 11.6 points, 8.9 rebounds, and 2.1 blocks in 14 games before joining Žalgiris in January 2016. With Žalgiris, he helped the under-18 squad qualify for the Euroleague Next Generation Tournament and was named MVP of the qualifying event. He made his LKL debut in September 2016 and his EuroLeague debut in October 2016, later helping the club win the inaugural King Mindaugas Cup. He also participated in the 2017 Nike Hoop Summit.

The Houston Rockets selected Hartenstein with the 43rd overall pick in the 2017 NBA draft. He made his NBA debut with the Rockets the following season and later appeared for the Denver Nuggets, Cleveland Cavaliers, Los Angeles Clippers, and New York Knicks. In 2024, he signed with the Oklahoma City Thunder. He won the 2025 NBA Finals in his first season in Oklahoma City, earning his first championship ring.

Hartenstein is a 7-foot center with a background in European club development. He brings interior size, rebounding presence, and shot-blocking instincts honed in the German and Lithuanian leagues. His EuroLeague and LKL experience provided an early foundation in team-oriented basketball and defensive positioning before he transitioned to the NBA.

Hartenstein is under contract with the Oklahoma City Thunder, where he contributed to the franchise's 2025 NBA title run. He maintains dual American-German citizenship and has represented Germany at the senior national team level.