| 6 ft 0 in (1.83 m)|
194 lb (88 kg)
| NHL Team (P)|
| Florida Panthers|
Rochester Americans (AHL)
|Born|| June 17 1982,|
|Pro Career||2000 – present|
Undrafted, Koistinen played professionally in his native Finland with Ilves Tampere of the SM-liiga for 6 seasons. On May 18, 2006, Koistinen signed with the Nashville Predators of the NHL. Koistinen made his North American debut in the 2006–07 season, playing with the Predators affiliate, the Milwaukee Admirals.
Koistinen made the Predators roster for the 2007–08 season and was used as a reserve defenceman. Koistinen scored his first NHL goal against Fredrik Norrena of the Columbus Blue Jackets in a 4-3 victory on December 27, 2007. Koistinen established 17 points by season end.
After his second season with the Predators in 2008–09, Koistinen signed a two-year contract with the Florida Panthers on July 1, 2009.
On November 25, the Florida Panthers placed Koistinen on waivers. Koistinen cleared waivers on November 26 and was sent to Florida's AHL affiliate in Rochester, New York.