Archbishop Nicholas Duncan-Williams is the Founder and Presiding Archbishop of Action Chapel International (ACI), headquartered in Accra, Ghana. He is recognised as the Patriarch and Father of the Charismatic Movement in Ghana and other parts of West Africa. He is also the Founder and President of Prayer Summit International (PSI), Dominion University and Television.

Archbishop Duncan Williams is the current Chairman of the National Association of Charismatic and Christian Churches (NACCC) and was a member of the immediate past Governing Board of the National Peace Council.