Hamburger SV As an 18-year-old, Zimmerman joined the German team
Hamburger SV, where he spent most of his time with Hamburg's reserve team. As a striker, Zimmerman played 14 games and scored three goals for the reserves during the 2006–2007 season. Zimmerman was originally signed while he was only 17 but the contract did not become official until he turned 18, skirting
FIFA's rules on foreign transfers by minors.
Kapfenberger SV After a trial stint at Belgian club
Cercle Brugge, it was announced on August 29, 2008, that Zimmerman was sold to the newly promoted
Austrian Bundesliga club
Kapfenberger SV, where he signed a two-year deal. Zimmerman made his Austrian Bundesliga debut as a second-half substitute in a losing effort to
SK Austria Kärnten, and scored his first goal for KSV on November 22 against Austrian giants
Red Bull Salzburg.
Mainz 05 On January 21, 2010, he returned to
Germany, signing an amateur contract for
FSV Mainz 05, where he played for the reserve team.
SV Darmstadt 98 On June 2, 2011, it was announced that Zimmerman would be joining recently promoted
3. Liga side SV Darmstadt. After two seasons with the club, Zimmerman left the club on June 17, 2013, with the plan to retire and return to school.
TSV Schott Mainz In July 2013, he joined six-tier club
TSV Schott Mainz. In his first season there, he achieved promotion to the fifth-tier
Oberliga Rheinland-Pfalz/Saar with the club. ==International career==