Advisor to the World Bank on the 1997 World Development Report
Member and Chairman of IMF's Group of Independent Experts who conducted the first ever external evaluation of the Enhanced Structural Adjustment Facility
Advisor to the UNDP's UN Special Initiative on Africa
Transforming the Periphery: A study of the struggle of social forces in Ghana for democracy and national sovereignty, United Nations, 1981 (ISBN92-808-0309-3; ISSN 0379-5772), DSDRSCA-83/UNUO-309
"Obstacles to Centralized Reform: An African Perspective" in Laura Wallace (ed.), Deepening Structural Reform in Africa, Lessons from East Asia, Washington, DC: International Monetary Fund, 1996.
Implementing Debt Relief for the HIPCs (co-author), Center for International Development, Harvard (1999).
"Whither the Partnership Agenda in Development Cooperation: A Country perspective", 4th Conference on Evaluation and Development, World Bank (2001)
"The New Partnership for Africa's Economic Development: Internal and External Visions", NEPAD: Internal and External Visions and Influences (2003)
Member Commonwealth Group of Eminent Persons for the Facilitation of the Signing of the Uruguay Round of Gatt Negotiations.
Member OECD group of high-level experts for the review of the OECD study on "Globalization and Linkages to 2020: Challenges and Opportunities for OECD countries (1996).
Member Commonwealth Expert Group on Good Governance and the Elimination of Corruption in Economic Management
Member Panel of High Level Personalities on African Development – an advisory group established to assist the UN Secretary-General in advocating greater support for African development and in coordinating the UN system's activities in the region.
Board Chairman for Heritage bank Ghana.
Papers and speeches given at conferences
"HIV/AIDS and Economic Development in Africa", Theme Paper, African Development Forum, Economic Commission For Africa, December 2000.
"Magnitude and Drivers of the Brain Drain in Africa", Keynote Address at the 1999 Africa Business Conference, Harvard University, 30 January 1999.
"Growth and Poverty Alleviation in Africa", ODC Conference on African Economic Recovery, 1996.
"Deepening Structural Adjustment Reforms and Policies for Growth in Africa", May 1996.
"Growth and Poverty Alleviation", ODC Conference on African Economic Recovery, 11–12 June 1996.
"Globalization: What has it meant for Africa and what does the future portend?" Presented at the Seminar on International Solidarity and Globalization: In Search of New Strategies, Stockholm, 1997.
"The Role of the State, the Ministry of Finance and the Treasury Secretary in the context of Economic Liberalization and Globalization", Abidjan, June 1998.
"The Politics of Administrative Reform", World Bank, June 1998.
"Mobilizing capital flows in support of accelerated African development - the role of capital markets", Washington, DC, July 1998.