Mario Diani has been a full professor of Sociology since 1996, first in the Department of Government of the University of Strathclyde in Glasgow and then at the University of Trento, that he joined in 2001. In 2010-2012 he was ICREA Research Professor in the Department of Political and Social Sciences of the Universitat Pompeu Fabra, Barcelona. 

He has worked extensively on social network approaches to social movements and collective action. His book The Cement of Civil Society. Studing Networks in Localities, based on a study of the structure of civic networks in British cities, has been published by Cambridge University Press in 2015. He has co-edited with Donatella della Porta The Oxford Handbook of Social Movements (Oxford University Press, 2015). Earlier books include Social movements (with Donatella della Porta, Blackwell, 20062), Social movements and networks (co-edited with Doug McAdam, Oxford University Press, 2003), Beyond Tocqueville (co-edited with Bob Edwards and Michael Foley, University Press of New England, 2001), Green Networks (Edinburgh University Press, 1995) and Studying Collective Action (co-edited with Ron Eyerman, Sage, 1992).

Articles have appeared in American Sociological Review, American Journal of Sociology, Theory and Society, Social Networks, Sociological Review, Acta Sociologica, European Journal of Social Theory, Mobilization, International Social Movement Research, Social Science Information, Res Publica, Environmental Politics,  Information, Communication & Society, Social Movement Studies, Interest Groups & Advocacy, Revue Suisse de Science Politique, Revista Vasca de Sociologia y Ciencia Politica, Revista Brasileira de Ciência Política, Partecipazione e Conflitto, Rassegna Italiana di Sociologia, Quaderni di Sociologia, Quaderni di Scienza Politica, Rivista Italiana di Scienza Politica, Enciclopedia delle Scienze Sociali, il Mulino, Democrazia e Diritto, Quaderni di Azione Sociale, Quaderni Piacentini.

He was the European editor of Mobilization from 1997-2005, and has served on a number of editorial boards including Contemporary Sociology, European Journal of Social Theory, Environmental Politics, Irish Journal of Sociology, South European Society and Politics, Quaderni di Sociologia e Quaderni di Scienza Politica. 
He is currently working on books on multimode approaches to political networks (with Dimitris Christopoulos and David Knoke) and the structure of civic networks in Cape Town, South Africa (with Henrik Ernstson and Lorien Jasny).