High school career
Kaufman-Renn attended Silver Creek High School in Sellersburg, Indiana. During his time at Silver Creek, he became the school's all-time leading scorer. During his junior season, he averaged 25.8 points, 9.6 rebounds, and 1.6 blocks per game. As a senior, Kaufman-Renn helped lead Silver Creek to state championship. He finished the season averaging 24.5 points, 11.8 rebounds, 3.6 assists and 1.9 blocks per game. A four-star recruit, Kaufman-Renn committed to play college basketball at Purdue University over offers from Indiana, North Carolina, and Virginia.
College career
Kaufman-Renn redshirted his first year on campus. The following season, he appeared in 35 games, averaging 4.5 points and 1.8 rebounds per game, making an immediate impact. Kaufman-Renn's production increased the next season, starting in every game. Against Utah State in the second round of the NCAA Tournament, he finished with 18 points, eight rebounds, three assists and two blocks in a 106–67 victory. He averaged 6.4 points and 4.0 rebounds per game as a sophomore. As a junior, Kaufman-Renn averaged 20.1 points and 6.5 rebounds per game, earning first-team All-Big Ten honors. He averaged 14.2 points and a career-high 8.3 rebounds per game as a senior, helping the Boilermakers finish 30-9 and reach the Elite Eight.
In August 2026, Kaufmann-Renn filed a lawsuit against the NCAA, seeking a sixth season of eligibility after not playing during a redshirt year as a freshman. This following the new five-for-five years NCAA ruling. On September 9, 2026, Kaufmann-Renn was granted a temporary restraining order by the United States Court of Appeals for the Sixth Circuit, allowing him to join a team. Kaufmann-Renn subsequently announced he would not return to Purdue.
On October 19, Kaufmann-Renn joined the Kansas Jayhawks.
