“…The employee-focused and moral dimensions of servant leadership raise important questions regarding its independence from other positive followerfocused leadership types, such as transformational, authentic, and ethical leadership which have, to date, been the focus of voice research (e.g., Detert & Burris, 2007;Hsiung, 2012;Walumbwa & Schaubroeck, 2009). Yet empirical work consistently confirms this independence, with research suggesting that servant leadership may explain between 5% and 28% more variance in a broad range of work outcomes, including organisational citizenship behaviour (Hoch et al, 2016), than these other leadership types (Sendjaya et al, 2017;Hoch, Bommer, Dulebohn, & Wu, 2016). It is servant leadership's unique focus on serving follower needs that is its defining quality (Chiniara & Bentein, 2016;Liden et al, 2014), and which makes salient research that explores its impact on other untested follower prosocial work behaviours, such as promotive and prohibitive voice.…”