Karrel was previously chair, awards director, assistant to the chief judge, site logistics director, publicity director and master of ceremonies for the regional science fair. He served on several leadership teams which were responsible for professional development for science teachers in new methodologies and curricula. Steve assisted in the delivery of the NS YES! 2008 Project-Based Learning Presentations pilot program and was one of three co-chairs who organized the 2007 Canada-Wide Science Fair in Truro.