About OC Auditor-Controller

The Orange County Auditor-Controller’s Office ensures that the County of Orange operates with financial integrity, accountability, and transparency. With more than 400 dedicated professionals, the office plays a critical role in managing, safeguarding, and reporting on billions of dollars in public funds that support essential County services. Every County service from healthcare and public safety to infrastructure and social services depends on sound financial management. The Auditor-Controller’s Office ensures that public dollars are accounted for, protected, and reported accurately, reinforcing trust between the County and the community it serves. Our Office serves as the County’s central financial steward, providing independent oversight, and essential accounting services that keep County operations running smoothly and responsibly. Our responsibilities span the full financial lifecycle from payroll and accounting to property tax distribution, financial reporting, and compliance with state and federal regulations.

Andrew N. Hamilton

Orange County Auditor-Controller

Andrew Hamilton is the 11th independently elected Orange County Auditor-Controller. Elected in 2022, he leads an office of more than 400 professionals responsible for safeguarding public funds and ensuring the County operates with financial accountability and transparency.

A Certified Public Accountant with nearly 35 years of public and private sector experience, Mr. Hamilton has served as various Controller and Accounting Management positions at publicly traded companies, a city finance director, a water district CFO, a member of the Lake Forest City Council, and accounting services for Fortune 500 companies.

Under his leadership, the Auditor-Controller’s Office oversees payroll for more than 18,000 County employees, financial reporting, property tax administration, and independent financial oversight that supports every County Department.

Mr. Hamilton was named as one of OC Register’s 125 Most Influential People in Orange County for 2025.

Executive Management

Learn more about our executive management team and their commitment to Orange County.

Andrew N. Hamilton

Andrew N. Hamilton

Orange County Auditor-Controller

Andrew Hamilton is the 11th independently elected Orange County Auditor-Controller. Elected in 2022, he leads an office of more than 400 professionals responsible for safeguarding public funds and… Read more

Salvador Lopez

Salvador Lopez

Chief Deputy Auditor-Controller

Salvador Lopez has been serving as the Chief Deputy Auditor-Controller since March 2019 for the County of Orange and is tasked with ensuring transparency and accountability in the management… Read more

Matt Holder

Matt Holder

Chief of Staff

Matt Holder serves as the Chief of Staff for the Orange County Auditor-Controller’s Office managing government relations and outreach for the department. Matt has over 30 years of… Read more

Heather Brinson

Heather Brinson

Executive Secretary II

Heather Brinson serves as the Executive Secretary II for the Orange County Auditor-Controller’s Office. Heather assists the Auditor-Controller and his executive management team with administrative communication, scheduling, special… Read more

Division Directors

Meet our Division Directors who lead key operational areas.

Paul Villanueva

Paul Villanueva

Director of Information Technology

Paul Villanueva recently assumed the role of Auditor Controller IT Director, bringing more than 25 years of experience with the County of Orange. Having spent over 15 years… Read more

Howard Thomas

Howard Thomas

Director of Satellite Accounting

As the Director of Satellite Accounting, Howard Thomas oversees all Satellite Accounting units and staff that provide accounting services to eight County departments, ensuring the accounting needs of… Read more

Megan Vu

Megan Vu

Director of Central Accounting Operations

Megan Vu is the Director of Central Accounting Operations for the County of Orange Auditor-Controller’s department. She leads seven units – Claims and Disbursing, Cost Revenue and Budget,… Read more

Admin Division Managers

Our Admin Division Managers ensure smooth operations across all departments.

Maribel Garcia

Maribel Garcia

Administrative Services Manager

Maribel serves the Auditor-Controller as Administrative Services Unit Manager. She began her career with the County of Orange over 25 years ago in the Auditor-Controller Collections Unit. Maribel… Read more

Cynthia Kaui

Cynthia Kaui

Public Information Officer

Cynthia Kaui serves as the Public Information Officer for the Orange County Auditor-Controller’s Office, where she leads all internal and external communication efforts. In this role, Cynthia oversees… Read more

Rodrigo Martinez

Rodrigo Martinez

Internal Audit Manager

Rodrigo Martinez is the Internal Audit Manager of the A-C IA unit. Rodrigo oversees the county’s mandated audits. Rodrigo holds several certifications, including Certified Internal Auditor (CIA), Certified… Read more

Sheri Vukelich

Sheri Vukelich

Financial Services Manager

Sheri Vukelich brings extensive experience in public sector finance and budgeting to her role as Financial Services Manager. She oversees the department’s annual budget, Strategic Financial Plan, and… Read more