Staff

Gianne began her career in 2013 as an Accountant/Auditor with the Orange County Auditor-Controller’s (A-C) office, where she worked on federal/state program claims and performed cash handling audits for the Health Care Agency. She then joined the A-C’s Internal Audit Division in 2016 as a Senior Auditor, where she performed internal control audits (ICA). She is now an Audit Manager for the Internal Audit Department’s ICA team. Gianne is a Certified Internal Auditor and Certified Information Systems Auditor. She holds a Bachelor’s degree in Business Administration with an Accounting concentration from California State University, Fullerton.

As an accomplished Information Technology, Senior Audit Manager with over 10 years of experience, Jimmy is responsible for leading the IT audit team.  

Jimmy is a Certified Information Systems Auditor, Certified Fraud Examiner, Certified Ethical Hacker and holds a Bachelor of Arts degree in Information Systems & Decision Science from California State University, Fullerton. 

Michael Dean began his career in 1996, shortly after the establishment of the Internal Audit Department. With over 25 years of experience in Internal Audit, Michael is the Senior Audit Manager leading the Internal Control Audits team. Michael has performed audits, reviews, and consultation engagements in most County departments throughout his career. Michael is a Certified Public Accountant, a Certified Internal Auditor, Certified Information Systems Auditor and holds a Bachelor of Arts degree in Accounting from California State University, Long Beach.

Aggie Alonso is an experienced executive with over 25 years of auditing experience. Aggie began his career in 1998 with the Los Angeles County Auditor-Controller’s Audit Division where he worked his way up from an Accountant-Auditor to the Division Chief of the Countywide Contract Monitoring. Aggie was responsible for managing approximately 40 professional auditors that primarily conducted fiscal, contract compliance, and other special reviews of County social service and health service contractors, and developed and oversaw the award winning Contractor Alert Reporting Database. Aggie currently serves as the Internal Audit Director and Chief Audit Executive for Orange County, the sixth largest County by population in the United States, with a budget totaling over $9 billion and employees totaling over 18,000. Aggie is responsible for managing Orange County’s internal audit function, whose primary objectives include developing and implementing risk-based audit plans focused on internal controls and information technology, and advising County management on appropriate internal controls, operational efficiency and effectiveness, and areas for process improvement. Aggie is a Certified Public Accountant, a Certified Internal Auditor, and holds a Certification of Risk Management Assurance from the Institute of Internal Auditors and a Bachelor of Arts degree in Accounting from California State University, Fullerton.