He won the Romanian Golden Boot award in 1992 while playing for Dinamo București.
Following his success with Dinamo a move to Swiss Super League took place and he played there until his retirement.
Gerstenmájer played three games at international level for Romania, making his debut under coach Mircea Rădulescu, in a friendly which ended with a 1–0 loss against Greece.
[2][4] Gerstenmájer's last game for the national team was a friendly which ended with a 2–0 victory against Mexico.
This biographical article related to a Romanian association football midfielder is a stub.