Kornfein started playing for the youth team of Hapoel Jerusalem but after moving to Beitar in 1995, he became a true symbol and icon for Beitar fans. In his last 6 years as an active player, Kornfein was the captain of the Beitar Jerusalem squad.
Kornfein won five titles as a player for Beitar :
3 Championships : 1997, 1998, 2007
1 Toto cup 1997/8 (23 December, 1997)
1 Peace cup 2000 (10 September, 2000, in Rome)
including back-to-back Championships in 1997 and 1998.
Few days before the beginning of training sessions previous to the 07-08 playing season, Korenfine announced his retirement as a player. He was then named as the club's general manager.
Kornfein holds a BA in Economics and Marketing from the Open University of Israel, and an MA in Business Administration from the Hebrew University of Jerusalem.