Since 1936 Callens, Pirenne, Theunissen & C° has been a major player in Belgium’s top 10 audit and accountancy firms with a strong sector-oriented approach. Known for the personal approach and integrity and independence the company is highly valued by its customers. In 2008 Callens, Pirenne, Theunissen & C affiliated with Crowe Global and now ranks among the 10 most renowned accountancy firm networks worldwide.