After starting his fourth season with the Winterhawks in 1994–95, Wiemer turned professional after 16 games and made his NHL debut with Tampa Bay.
Wiemer then played with the Flames for three seasons establishing himself as an effective enforcer and agitator due to his size, propensity for fighting and ability to deliver hits consistently.
Prior to the 2001–02 season, Wiemer was traded by the Flames, along with Valeri Bure, to the Florida Panthers for Rob Niedermayer on June 23, 2001.
[1] Jason recorded a career high 31 points in his lone season with Panthers before he was dealt to the New York Islanders for Branislav Mezei on July 3, 2002.
[4] On March 9, 2006, Wiemer was traded during the 2005–06 season from the Flames to the New Jersey Devils for a fourth round pick in the 2006 NHL Entry Draft.