“…Whereas principals and other administrators have been considered the primary (and often sole) 'leaders' in schools throughout most of the 20 th century, the concept and practice of 'teacher leadership' has gained increasing attention in recent years (Barth, 2001;Beachum & Dentith, 2004;Hunzicker, 2012;Margolis & Deuel, 2009;York-Barr & Duke, 2004). The priority given to teacher leadership is reflected in the National Science Foundation's (NSF) Math and Science Partnership (MSP) program, which aims to "prepare highly qualified, experienced teachers to become exceptional Teacher Leaders" (NSF, 2010), and in a growing number of studies related specifically to science teacher leadership (e.g., Howe & Stubbs, 2003;Pellicer & Anderson, 2001;Wallace, Nesbit, & Miller, 1999;Yow & Lotter, 2014;Mentzer, Czerniak, & Struble, 2014). Teacher leadership is being increasingly recognized as a catalyst for change and critical element to sustain curriculum reform efforts (Beachum & Dentith, 2004;Hunzicker, 2012;Margolis & Deuel, 2009;Larkin, Seforth, & Lasky, 2008;York-Barr & Duke, 2004).…”