The authors provide a perspective, as scholars and practitioners, of the organizational, demographic, legal and contextual variables that inform the past and the future of faculty unions in US colleges and universities. They ask, how best to conceptualize and evaluate the impact of faculty unions; from the inception of academic unionization in the 1960's to the present, and further, what is known and not known about collective bargaining. Issues examined include: factors that influence negotiation processes, governance, bargaining dynamics, the institutional and demographic factors...