STG Partners

Dr. Z. Ertunc Sirin is a distinguished legal advisor and academic, with over 25 years of experience in tax law, customs law, administrative and procurement law, and regulatory compliance. He has represented domestic and international clients across contentious and non-contentious matters, particularly in international arbitration and transnational litigation. His practice bridges academic rigor with strategic advisory, shaped by nearly three decades of teaching, publishing, and consulting.

Formerly co-founded and led a major Turkish law firm's tax, customs, and administrative law practice. Advised on regulatory and compliance matters, represented clients in disputes, and acted as legal strategist in cross-border regulatory cases.

Supports clients in high-stakes arbitration and litigation cases, including construction and infrastructure projects, joint venture disputes, bilateral investment treaty claims, and commercial conflicts under FIDIC forms. Appears before national courts and arbitral tribunals, including ICC, ISTAC, and ad hoc tribunals.

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