Corporate Governance Committee

Neslihan Tonbul
Chairwoman

Having graduated with a high degree from the Economics and Political Science department of Rutgers University in 1981, Neslihan Tonbul completed her post-graduate study on International Finances and Economic Development at The Fletcher School of Law and Diplomacy – Tufts University. Appointed to the senior executive positions at New York, London and Istanbul agencies of variousinternational finance institutions (The Irving Trust Company, The Bank of New York and BNY Mellon) from 1983 to 2008, she was appointed as regional manager overseeing a region that includes the Middle East, Africa, Eastern Europe and Turkey. Serving as board member to the prominent Turkish holdings since 2008, Neslihan Tonbul is a board member of Petkim, Alarko Holding and Vakıfbank International. Gaining expertise in the Management of Family Companies by studying at the Harvard Business School with CFEG, Tonbul has been teaching “Management of Family Companies” at the Faculty of Economics and Administrative Sciences of Koç University since 2017. Neslihan Tonbul is an independent board member of Tofaş since 2018. Serving as senior advisor at New Zealand Trade and Enterprise (NZTE) since 2014. Neslihan Tonbul is proficient in English, French, and Azerbaijani.

Yağız Eyüboğlu
Member

Yağız Eyüboğlu graduated from Boğaziçi University with BA degree in Economics in 1991, he earned his MBA from Koç University in 1996. He started his professional life as a Management Trainee at Arçelik A.Ş. in 1991. In 1993, he was promoted to Koç Holding Headquarters, where he worked for more than 10 years, as Senior Internal Auditor, Assistant Financial Coordinator and Financial Coordinator, respectively. Between 2004 and 2009, Eyüboğlu assumed several responsibilities within the Koç Group, namely, CFO of Arçelik A.Ş., CEO and Board Member of Beko Elektronik A.Ş., Assistant to the President of the Koç Holding Foreign Trade and Tourism Group, and Human Resources Director of Koç Holding. In 2009 he joined Aygaz A.Ş. where he served as the C.E.O. of the company until October 2015. Following his assignment to Koç Holding as the Deputy President of Energy Group in October 2015, he is now serving as the President of Energy Group at Koç Holding since April 2016. Serving as Board Member at several companies of Koç Conglomerate, Eyüboğlu also carries out the positions of President of World LPG Association (WLPGA), President of the Board of Trustees of Turkish Family Health and Planning Foundation (TAPV), Board Member of International Competitive Research Institution. He has started to serve as a Member of the Board of Directors of Aygaz A.Ş. in 2016.

 

 

Zeynep Keskin
Member
Zeynep Keskin completed her Master’s degree in Financial Engineering at Boğaziçi University and her Bachelor’s degree in Economics at Middle East Technical University. She began her professional career in 2008 as an Auditor at Deloitte. Between 2010 and 2015, she held various positions within the Financial Reporting Department at Tüpraş; and in 2015 – 2016, she worked as a Compliance Officer at the Bahrain branch of İşbank.
Since 2016, she has assumed several managerial roles in the fields of Financial Reporting and Planning at Tüpraş. Following 2021, she served as the Director of Financial Planning and Reporting, and in 2024, she continued her career as the Group Director of Finance.
As of March 2026, she has been appointed as the Assistant General Manager of Finance at Aygaz.