Conversation so far:
In what year did John Hartson join Luton Town?
Hartson turned professional in 1992 and made his Luton Town first team debut as a substitute in a 1–0 League Cup defeat to Cambridge United on 24 August 1993.
Did John Hartson play for Arsenal?
In total, Hartson played 53 times for Arsenal

Question: How many goals did he score in his Arsenal career?
Self-contained rewrite: How many goals did John Hartson score in his Arsenal career?