Andersen Global Expands Practice in Turkey with Istanbul-Based Tax Firm Andersen Global strengthens its presence in Turkey through a Collaboration Agreement with tax firm ECC Denetim, adding dimension to the organization's presence in the country and building upon its strategy to provide a full suite of integrated services through its member and collaborating firms globally. The Istanbul-based firm was established in 2020 by founder and Managing Partner Celal Çelik, PhD, who possesses more than 15 years of experience working at the Turkey Ministry of Finance and more than 15 years of experience in private practice. The firm provides tax and advisory services, assisting domestic and foreign clients with tax matters, due diligence, VAT, VAT return, management advisory, establishments and restructuring of companies, and navigating labor legislation.