Executive Management

Metin Özyürek graduated in 1991 from the Department of Geophysics Engineering, Istanbul University, and in 2008 from the Banking and Insurance Department, Anadolu University. After serving as the regional director of Marmara and Central Anatolia, and general coordinator at HDI Sigorta in 1993-2003, he became the General Manager of Özyürek Sigorta in 2003. Then in 2010-2012, he served as a project engineer and executive board member at Nessen Uluslararası Tic. Ltd. His articles on the insurance sector were published in Dünya Newspaper and local newspapers. In 2012-2016, he worked as Marmara Regional Director of Istanbullines Denizcilik. Having started working in GÜBRETAŞ in October 2016, Özyürek has been working as the Assistant General Manager responsible for Sales and Marketing.

Mesud Şenkardeşler graduated in 2003 from the Department of International Relations, Bilkent University, and started to work as an export expert at Petlas A.Ş. in the same year. He specialized in such main functions as sales, marketing, product management, field sales coordination and import-export operations. In 2005-2006 he served as the product expert in charge of Marmara region at Tyco Sağlık A.Ş., then in 2007-2011 as Process-Business Development and Network Management advisor at Ototronik Otomotiv ve Enerji A.Ş. In 20011-2015, he served as the automotive, energy and finance sector manager at GfK Türkiye, then a senior advisor for a year. In 2015-2016, he worked as Senior Manager in Borem Araştırma. In GÜBRETAŞ where he started working as Foreign Trade Manager in June 2016, he continues to serve as the Assistant General Manager responsible for Supply Chain to which he was appointed in the same year.

İbrahim Yumaklı graduated in 1992 from the Department of Management, Faculty of Economic and Administrative Sciences, Uludag University. He started his work life in 1993 as an expert of import operations at Marshall Boya A.Ş., then served until 2011 as a manager in Marshall Boya A.Ş. within Akzo Nobel Türkiye and financial departments of group companies. In 2011, he transferred to Al-Jazeera Turkey, and managed Cine5 TV channel owned by Al-Jazeera Turkey in 2012-2015. In January-October 2016, he served as the International Operations Director of Anatolian News Agency. Yumaklı started from October 2016 at GÜBRETAŞ as the Deputy General Manager and Executive Director, and was appointed as the General Manager on 5 May 2017.

Mahmut Karaman graduated in 1990 from the Department of Mechanical Engineering, Yıldız Technical University. He received his master’s and doctoral degrees in control systems in the United States in 1997. He received his master of business administration (MBA) degree in 2007 from the University of Colorado, Boulder. In 1998-2001, he worked at Hutchinson Technology, a significant company in the hard disk industry, and in 2001-2008 at Seagate Technology, the global leader in hard disk manufacturing. During that time, he taught courses at master’s level at the university in Colorado and Denver. In 2008-2013, he served as the Revenue Management Director at Turkish Airlines (THY) and Qatar Airways. In 2013-2015, he worked as the General Manager of Yıldız Technopark, then started at GÜBRETAŞ in February 2015 as an Assistant General Manager responsible for Operations and Investments. He also serves as a Deputy Chairman of the Board at our subsidiary TARKİM Bitki Koruma San. ve Tic. A.Ş.

Having received his master’s degree in finance from London Business School after receiving his Bachelor’s degree in Business Administration at Bosphorus University, Serttaş received certification as a Certified Public Accountant. After having started his career in the audit department of Arthur Andersen in 1996, he worked at the Istanbul, Johannesburg, London and Abu Dhabi offices of Arthur Andersen and Ernst & Young in financial audit and financial reporting areas. Then, he served as a General Manager consultant at IPIC in Abu Dhabi and as the founding CFO of the International Islamic Liquidity Management Company in Kuala Lumpur and Tosyalı Toyo Çelik A.Ş in Istanbul. He started working as an Assistant General Manager in charge of Finance at GÜBRETAŞ in September 2018.