Staff Directory

Meet our team.

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Agripino Alonso Portrait
Aggie Alonso

CPA, CIA, CRMA
Director of Internal Audit

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.

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Michael Dean portrait
Michael Dean

CPA, CIA, CISA, CCSA
Senior Audit Manager

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.

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Jimmy Nguyen portrait
Jimmy Nguyen

CISA, CFE, CEH
IT Audit Manager II

Jimmy Nguyen is an Information Technology audit manager with over 12 years of IT/security auditing experience covering diverse industries. Jimmy has served the County of Orange since 2016 and is responsible for managing the IT audit team of the Internal Audit Department. 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. 

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Scott Kim

CPA, CISA, CFE
IT Audit Manager I

Scott Kim is an experienced audit professional with over 10 years of auditing experience including positions with the California Franchise Tax Board and County of Riverside. Scott joined the County of Orange Auditor-Controller Internal Audit Division in 2013 as a Senior Auditor and worked his way up to IT Audit Manager for the recently re-established Internal Audit Department. Scott’s primary job responsibilities include assisting with the development of the Countywide IT risk assessment and IT audit plan, reviewing Countywide agency IT controls and procedures, advising on agency system implementation and development, providing guidance on development of department IT policies, and identifying areas for process improvements. Scott is a Certified Public Accountant, a Certified Information Systems Auditor, a Certified Fraud Examiner, and holds a Bachelor of Arts Degree in Business Administration with an emphasis in Accounting from California State University, Fullerton.

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Gianne Morgan

CIA, CISA
Audit Manager

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.

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Stephany Franco

Senior Auditor

Stephany Franco has over nine years of experience in auditing and accounting with expertise in internal audit, fiscal monitoring, and governmental accounting. Stephany’s primary focus is conducting Internal Control Audits and Information Technology Audits for the County of Orange. Stephany holds a Bachelor of Arts degree in Economics and Accounting from the University of California, Santa Barbara.

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Gabriela Cabrera

Senior Auditor

Gabriela Cabrera began her public service with the County as an Accounting Intern for John Wayne Airport in 2013, shortly after earning her Bachelor’s in Business Administration with a concentration in Accounting from California State University, Fullerton. Subsequently, she worked as an Office Technician for Social Services Agency, an Accounting Technician for the Clerk-Recorder, and as an Accountant/Auditor and Senior Accountant/Auditor for the Auditor-Controller’s office. These roles taught Gabriela how unique department processes achieve common goals, as well as the importance of collaborating with different business areas to maximize the impact of our public service. Since 2019, Gabriela has applied these insights to the Internal Control Audits she performs as a Senior Auditor with the Internal Audit Department.

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Alejandra Luna

Senior Auditor

Alejandra joined the County of Orange in 2015 and held various accounting positions within the Auditor-Controller’s office before joining the Internal Audit Department in 2019 as a Senior Auditor. Alejandra holds a Bachelor of Arts degree in Psychology and a Master of Science degree in Accountancy. 

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Mary Ann Cosep

Senior Auditor

Mary Ann began her career in the tax practice at PricewaterhouseCoopers.  Subsequently, she worked as an auditor at the HHS Office of Inspector General, where she performed a wide variety of audits involving not-for-profit and healthcare organizations, educational institutions, and entities subject to the Affordable Care Act (ACA) and Medicare regulations.  In 2022, Mary Ann joined the Internal Audit Department.  As a Senior Auditor, her primary focus is conducting internal control audits.  She holds a Bachelor of Science degree in Business Administration, with a concentration in Accounting from California State University, Los Angeles.