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Mark J. Sullivan, CFE, CPP, CFI
Market Managing Principal and Co-Global Leader – Forensic and Investigation Services
Grant Thornton LLP (Retired)
Chicago, Illinois
Mark J. Sullivan, CFE, CPP, CFI, retired in May 2024 after 15 years as a senior partner and co-global leader of the forensic and investigation services practice at Grant Thornton LLP (GT). He served in similar roles at Deloitte and Kroll. Sullivan obtained his Certified Fraud Examiner (CFE) credential while working in the fraud and security consulting practice at Arthur Andersen & Co.
Throughout his career in fraud prevention and detection, Sullivan conducted risk assessments and worked on behalf of boards of directors and special committees for multinational companies across the Americas, Europe, the Middle East, Africa and Asia. He led more than 1,000 audit, tax and advisory professionals to record revenues during his tenure as the market managing principal of GT’s Chicagoland offices.
Sullivan previously served as president of the ACFE Greater Chicago Chapter and Chair of the ACFE Foundation Board of Directors. He’s director certified by the National Association of Corporate Directors and served as chair of the risk committee on GT’s partnership board. He currently serves on the advisory board of the International Association of Interviewers and is a Certified Forensic Interviewer.