Isabel Derison, CCSA, CIA, CRMA, IFA, RFA
Outside North America Lead Director, 2025-26
Isabel Derison is the 2025-26 Outside North America Lead Director on the Global Board of Directors of The IIA. She also served as President of the Board of Directors with IIA Belgium (2021-2024) and is a Partner in Business Risk Services at Grant Thornton Belgium.
Isabel has over 20 years of experience in internal and external auditing. She began her career as an external auditor at KPMG and, after six years, transitioned to an internal auditor role at SD Worx (Payroll/HR). In 2017, she developed the internal audit function at ZNA (the largest hospital network in Belgium). In 2022, she joined the partner team at Grant Thornton Belgium.
Isabel is a Certified Internal Auditor (CIA), holds a Certification in Risk Management Assurance (CRMA), Certification in Control Self-Assessment (CCSA), and is a Registered Fraud Auditor (RFA) at the Institute of Fraud Auditors (IFA Belgium). Furthermore, Isabel is a subject matter expert in ESG and Sustainability.
She holds a master’s degree in applied economics with a specialization in Accountancy, Tax, and Internal Audit from the University of Antwerp. She graduated from Vlerick in the first batch of students in the course ‘Taking the Lead in Sustainability.’