The Oversight Advisory Committee is composed of 4 members for the period of 1st October 2023 to 30th September 2026:



Joe Ioculano

Chair of the OAC since October 2023

Mr. Ioculano has over 30 years of international experience, ten of which in trusted leadership roles reporting to CEOs and Audit & Risk Committees in large international organisations in Europe, the Americas, Asia, and the Middle East.

Furthermore, Mr. Ioculano has expertise in internal audit, strategy, risk management, governance, compliance and finance. He is Chartered Accountant with executive training at Harvard, Columbia and IMD. 

Maxine Manditsch

OAC member since October 2023

Ms. Manditsch has more than 30 years’ experience in the public and private sector in the UK and internationally. Her early career began in the UK at Grant Thornton followed by Price Waterhouse Coopers where she was a Tax Manager.

Ms. Manditsch held senior leadership roles in oversight within the United Nations, including Chief of Investigations with the World Food Programme, UNRWA and the World Health Organisation. Ms. Manditsch is currently a Non-Executive Director of the Scottish Rugby Union.


Carsten Meyer

OAC member since October 2023

Mr. Meyer is a senior oversight executive with more than 20 years of experience in audit, evaluation, investigation and advisory services. He served for 7 years as Director Oversight of the IAEA and for more than 10 years as external auditor of different international organisations.
After his retirement, he is now advising international organisations in the areas of oversight, risk management and process redesign.

Mr. Meyer holds a master's degree in economics and organisational sciences and is accredited validator of the Institute of Internal Auditors.

Adan Ruiz Villalba

OAC member since October 2023

Mr. Villalba is an evidence-based believer in using evaluation to improve policies and impact United Nations mandates. He has a strong record of leading teams that use innovation to improve the utility and impact of evaluations. He is an evaluator with more than 20 years of experience applying evaluation methods at national and international levels across social, economic development, security, and technical assistance (UNDP/MDGF, UNODC, Spanish Ministry of Foreign Affairs, OECD/DAC, WIPO). 

He is Head of the Evaluation at the World Intellectual Property Organization and has been Vice-Chair and Treasurer of the United Nations Evaluation Group for the last four years. He is leading the way in renovating how evaluations are conducted and used by integrating behavioral insights, data visualization and complexity analysis.  

Mr. Villalba holds a master’s degree in international Sustainable Development from Brandeis University and a bachelor’s degree in law (LLB) from the University Complutense of Madrid. His interests are varied, but his passions revolve around complexity, behavioral science, data visualization and science.