We are Grant Thornton

Cleveland, Ohio

Service Experience
  • Advisory
  • Risk advisory
  • Transaction advisory

John D. Barnes




Executive summary


John has more than 28 years of combined experience in internal audit, Sarbanes-Oxley, Specialty Attestation reports, external audit, performance audits and accounting consulting services. Prior to joining Grant Thornton in 2004, John held a manager position in a national accounting firm and an internal audit consulting firm. John is based in Cleveland, OH and leads our Cleveland Office and risk advisory services group in Ohio, Western Pennsylvania and Michigan. John's experiences include providing external audits and internal controls consulting within the COSO framework and coordinating such work with all major accounting firms. He has managed complex multi-project and multi-national engagements. He has overseen execution of multiple engagements including progress reporting and deadline management. His experience includes providing services to multi-national manufacturing firms, technology companies, retailers,  government contractors, hospitals, financial services and retailers.




Professional qualifications and memberships

  • Certified Internal Auditor (CIA)
  • Certified Risk Management Assurance (CRMA)
  • Certified Public Accountant (Maryland and Ohio)
  • Chartered Global Management Accountant
  • American Institute of Certified Public Accountants
  • Institute of Internal Auditors
  • Ohio Socitey of CPA's


Community involvement


John is a current board member of Junior Achievement of Greater Cleveland, an advisory board member of the City Year Cleveland, a Board member of Engage! Cleveland and audit committee member of Greater Cleveland Food Bank. John is a graduate of the Leadership Cleveland Class of 2019. John is also on the accounting advisory board at Penn State, and a member of the Penn State Varsity S Club. John is a past member of the advisory board of NACD Greater Washington Chapter, Greater Baltimore Committee and Arts on The Block and a prior president of The Penn State Varsity S Club.





  • MBA, Finance, R.H. Smith School of Business,University of Maryland
  • BS, Accounting and International Business, Pennsylvania State University

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