Clayton B. Dean, MBA, CPA
Director of Internal Audit
770-420-4737

Clay joined the Department of Internal Audit as Director in April 2006. He previously worked as the Special Assistant to the Regional Director for the Defense Contract Audit Agency, U.S. Department of Defense in Smyrna, Georgia for seven years. Clay was also the Training Manager at the Defense Contract Audit Training Institute in Memphis, Tennessee for 10 years. Additionally, Clay has a Master of Business Administration degree and is a Certified Public Accountant (CPA) with more than 30 years of auditing experience.

Len Ohnstad, MBA, CPA, CIA
Senior Internal Auditor
678-797-2445

Len joined the Department of Internal Audit as a Senior Internal Auditor in June 2008. He previously worked as a Senior Auditor for the Board of Regents of the University System of Georgia, AGL Resources, Inc., and Rollins, Inc. Len has a Bachelor of Accounting degree from the University of Minnesota and a Master of Business Administration degree from Kennesaw State University. Additionally, Len is a Certified Public Accountant (CPA) and a Certified Internal Auditor (CIA) with more than 15 years of internal audit experience.

Jennifer L. Riva, MBA, CISA
Senior Information Technology Auditor
678-797-2584

Jennifer joined the Department of Internal Audit as a Senior Information Technology Auditor in March 2008. She previously worked as a Senior Internal Auditor for AT&T and held positions in Information Security, Infrastructure support, and auditing with over 15 years experience. Jennifer has a Master of Business Administration degree from Kennesaw State University and a Bachelor of Management Information Systems degree from the University of Alabama in Huntsville. Additionally, Jennifer is a Certified Information Systems Auditor (CISA) designated by the Information Systems Audit and Control Association (ISACA).

Brenda Haverkos, CPA
Senior Internal Auditor
770-423-6293

Brenda joined the Department of Internal Audit in August 2012.  Prior to that, she worked in public accounting and has over 13 years of experience in auditing both private and public companies.  Her industry experience includes a strong focus on auditing non-profit organizations, with a specialty in compliance audits, in accordance with the requirements under OMB Circular A-133.  She has also worked in private industry as the CFO at a Federally-funded community health center.  Brenda received dual degrees in both Accounting and Finance from Florida Atlantic University.  She is a Certified Public Accountant (CPA) and is a member of the AICPA and Georgia Society of Certified Public Accountants.

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