Stewart enrolled at
Duke University in June 2023 and took part in the Blue Devils' summer practices. In October 2023, Stewart set the Duke record for the standing vertical leap (36 inches), a mark previously held by
Zion Williamson. In his freshman season, Stewart played limited minutes and averaged 2.6 points and 3.2 rebounds per game as a reserve behind
Mark Mitchell and
Kyle Filipowski. On April 19, 2024, Stewart entered the transfer portal. On May 3, 2024, Stewart transferred to
Ohio State. On May 8, 2025, Stewart transferred for a second time, transferring to
Oregon ==National team career==