- DOB May 28, 2002
- Age 20
- Place of birth Nurnberg, Germany
- POSITION Midfielder
- HEIGHT 6'2"
- WEIGHT 175
- U.S. CAPS
- CLUB Randers FC
Tillman made his professional debut on 9 June 2020 when he came on as a substitute for Bayern Munich II, the club's reserve side, against Zwickau. He started and played 57 minutes as Bayern Munich II won 2–0.
He was promoted to Bayern Munich's senior team during the first round of the 2021–22 DFB-Pokal against Bremer SV on 25 August 2021. He came on as a substitute at the start of the second half and scored a goal in the 12–0 victory.
He made his Champions League debut on 8 December 2021, coming on as a substitute late in the second half against FC Barcelona.
Tillman is eligible to represent both Germany, his birth nation, and the United States, through his father. He has represented the United States at the under-15 level and Germany up to the under-21 level.
In May 2022 Tillman applied for a switch to play for the United States national team.