As well as an academic in political science and journalism, non-violent social movements, ecological justice in Oceania and Indigenous peoples' rights,  Joshua lectures at a number of universities and educational institutions worldwide including the University of Hawaii, the International Training Center for Teaching Peace and Human Rights in Geneva, Galway University in Ireland and the University of the District of Columbia in Washington D.C. He also performs a number of leadership and supervisory roles, including as an Asia Pacific Leadership Program Fellow at the East-West Center, Area Coordinator for Amnesty International USA, Senior Advisor to the Unrepresented Nations and Peoples Organization in the Hague, Board member of Peace Action, Board member of the Human Rights Task Force for the United National Association of the USA, and former Chair of the AIUSA Indigenous Peoples Task Force. Josh has also been selected to work with Nobel Peace Prize Laureate and U.S. Vice-President Al Gore on The Climate Project.