Board of Directors Executive Committee

Tayfun Öneş

CEO

After graduating from Robert College in Istanbul, Mr. Tayfun Öneş earned his bachelor’s degree in economics from Middle East Technical University and began his professional career in the Finance Department of Mercedes-Benz Türk A.Ş. Following three years in Export Group Management within the same company, he moved into the cement industry, holding a series of managerial positions including Marketing Planning Manager at Çanakkale Çimento, Strategy and Business Development Manager at Akçansa, Company Manager of Agregasa, Deputy General Manager of Sales and Marketing at Akçansa, and Board Member of Karçimsa.

In 2008, Mr. Öneş returned to the automotive sector and joined Mercedes-Benz Financial Services Türkiye, where he served as Deputy General Manager of Sales and Marketing for 6 years. Between 2014 and 2022, he held the positions of CEO of Mercedes-Benz Financial Services and Board Member of Mercedes-Benz Romania.

Mr. Öneş continued providing corporate training and career consulting services through Ones Academy until April 2026.

Tayfun Öneş has been appointed as General Manager and Board Member of Akçansa as of June 18, 2026.

LEADER

Ülgen Eryürek Aslan

Vice GM – Human Resources and Corporate Communication

Ömer Sinan Genç

Vice GM – Operations

Thomas Gerstenhauer

Vice GM – Finance

İlker Koç

Vice GM – Ready Mixed Concrete, Aggregate Sales and Marketing

Sinan İnaç

Vice GM – Procurement, Logistics and International Trade

MANAGEMENT

Ömer Sinan Genç

Vice GM – Operations

Ömer Sinan Genç graduated from Ege University, department of Chemical Engineering. He completed his master’s degree in chemical engineering at Izmir Institute of Technology. He has been working for Akçansa as Production Engineer – Ladik Plant, Clinker Supervisor – Büyükçekmece Plant, Production Manager – Büyükçekmece Plant, Plant Manager – Ladik and Plant Manager – Çanakkale since 2007. As of 1 January 2024, he has occupied the position of Vice General Manager – Operations.

Thomas Gerstenhauer

Vice GM – Finance

Thomas Gerstenhauer graduated from International Partnership of Business Schools (Reutlingen/London) with a degree in European Business Administration and completed his Executive MBA at Friedrich Schiller University, Jena. He started his professional career at Schroder Salomon Smith Barney in 1998 in London, including assignments in Melbourne and New York. From September 2003 to 2007, he worked for HSH Nordbank as Deputy Head of Leveraged Finance. Thomas joined Sal. Oppenheim Jr. & Cie. KgaA as Senior Vice President – Investment Banking in November 2007. From April 2011 to September 2014, Thomas did run his own Corporate Finance advisory business, where he amongst others acted as part of the Board of Creditors for IVG Immobilien AG. Since he joined Heidelberg Materials in September 2014, he acted as CFO of Mibau Stema Group & Finance Manager – Aggregates Northern Europe and from 2020 onwards as CFO and Deputy CEO of Mibau Stema Group. As of 1 November 2024, he has occupied the position of Vice General Manager – Finance.

İlker Koç

Vice GM – Ready Mixed Concrete, Aggregate Sales and Marketing

İlker Koç received his bachelor’s degree in Civil Engineering from Middle East Technical University and his master’s degree in Business Administration (Executive MBA) from Sabancı University. He started his career as a Field Engineer at Rizzani de Eccher in 1994 and then worked as a Site Superintendent at Astaldi and Sinta between 1995 and 1998. He joined Akçansa in September 1998 as a Marketing Planning and Sales Specialist. Between 2008 and 2012, he worked as a Senior Engineer at HeidelbergCement Technology Centre in Germany. He continued his career at Akçansa as a Quality and R&D Manager, Marketing and Special Products Manager, and Technical Sales Support and Special Products Manager. Between December 2020 and November 2021, he held the position of Company Manager at Karçimsa. As of 1 December 2021, he has occupied the position of ‘Assistant General Manager – Ready Mixed Concrete, Aggregate Sales and Marketing.’