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The City of Portland, Oregon

Auditor Mary Hull Caballero

Promoting open and accountable government

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About us

Portland has had a City Auditor since 1868, and the position has been elected by voters since 1891. As the sixth elected official in Portland’s government, the Auditor is functionally independent of City Council and accountable only to the public. The mission of the Auditor’s Office is to promote open and accountable government by providing independent and impartial reviews, access to public information, and services for City government and the public.

The Auditor’s Office has a $10.2 million operating budget. Fifty-five employees carry out their work in seven divisions. Those primarily responsible for ensuring the City is accountable are Audit Services, Code Hearings Office, Independent Police Review, and the Ombudsman. The divisions responsible for ensuring the City is transparent are Archives and Records Management and Council Clerk/Contracts. Staff in Management Services oversee City elections and the lobbyist registration program in addition to providing support to all divisions in the Auditor’s Office.

City Auditor Mary Hull CaballeroMary Hull Caballero is the elected Auditor for the City of Portland, taking office in January 2015. Mary was re-elected in 2018, and begins her second term in January 2019. She previously worked as a performance auditor at Metro Regional Government in Portland and the Oregon Department of Transportation. Prior to entering the auditing field, Mary co-founded and managed a public policy leadership development organization and was a newspaper reporter. She holds a Master's Degree in Public Policy and Management from Carnegie Mellon University. She received her undergraduate degree in Communication from Lewis and Clark College. Mary is a Certified Internal Auditor and a Certified Government Auditing Professional.

Auditor's Advisory Council

Auditor’s Quarterly Calendars 


Management Team (in alphabetical order)

General Counsel Jennifer AmiottJennifer Amiott joined the City Auditor's Office as General Counsel in 2018. She provides legal and policy advice to the Auditor and division managers on a broad range of issues related to performance auditing, complaint investigations, public records and meetings, lobbying regulations, and police accountability. Previously, Jennifer served as the Director of Legal Aid Services of Oregon's Native American Program. She holds an undergraduate degree from Miami University, a Master's Degree from Portland State University, and a J.D. from Lewis and Clark Law School. 

Council Clerk/Contracts Supervisor Toni AndersonToni Anderson was first introduced to the City of Portland when hired for a summer work position through the CETA training program. This led to being hired in 1976 to work in the neighborhood office for a volunteer board of her beloved North Portland. The two-person office worked out of the senior center and had its own mascot Sammy an orange tabby cat. Toni later worked for Bonneville Power but found her way back to the City in 1986 in the Auditor’s Office, where she worked her way up through the ranks to Council /Contracts Supervisor. If Toni could change one thing it would be to have an office cat or dog.

City Archivist Diana BanningDiana Banning manages the Archives and Records Management Division and has served as the City Archivist since 1997. As the City's Archivist, she provides city-wide leadership on archives and records management issues, and oversees the Portland Archives and Records Center. Prior to her time with the City, she was the County Archivist for King County, Washington. 

She has a Master of Library Science degree from the University of Washington and is certified through the Academy of Certified Archivists.

Ross Caldwell is the Director of the Independent Police Review (IPR). He grew up in Toledo, Washington and went to college at the University of Washington and law school at Lewis & Clark College. Prior to joining IPR, he worked as a Programs Director for the Criminal Justice Commission, overseeing the Justice Reinvestment Grant Program and several other program areas. Ross has worked extensively with the different criminal justice system associations and counties around the state. Prior to the Criminal Justice Commission, Ross worked as a Deputy District Attorney in Multnomah County.

Audit Services Director Kari Guy

Kari Guy has worked in Audit Services since 2007. Before joining the City, she spent 10 years with Washington State Senate Committee Services, both as a fiscal analyst to the Ways and Means Committee and as a policy analyst with various natural resources committees. Kari holds a Masters of Public Administration from the University of Washington and a bachelor's degree from Stanford University.

She is a Certified Government Auditing Professional, and is a member of the Institute of Internal Auditors and the Association of Local Government Auditors.

William Guzman is the City's Chief Hearings Officer. He has over a decade of legal experience in civil, criminal, and administrative matters. In 2006, William received his Juris Doctor from Willamette University, which prepared him to complete a Master of Laws degree from Columbia University in New York City. Early in his career, William served as a law clerk, and later, as a public defender in Alaska. These formative experiences allowed him to understand the importance of providing culturally responsive legal advocacy. William brought this perspective to his work in public service when he served in the last year of Mayor Charlie Hales' Administration and to his experiences with the National Crime Victim Law Institute, which operates out of Lewis and Clark College. William's goal is to provide a space that facilitates the City of Portland affording its constituents equal treatment under the law and the Portland Code while affirming their need for dignity and respect.

Chief Deputy Auditor Amanda Lamb

Amanda Lamb has served as the Chief Deputy Auditor since 2018. In her role, she provides policy support for the Auditor’s priorities and manages large or multi-division initiatives. Prior to joining the Auditor's Office, Amanda worked as a researcher on criminal justice policy and as a performance auditor for state and local government.

She holds a Bachelor's degree in Philosophy from Lewis and Clark College and a Master of Public Administration from Portland State.

Business Operations Manager Joshua McNeal IVJoshua McNeal IV assumed the role of Business Operations Manager in 2018. He provides administrative support and flexibility to multiple divisions as the Auditor’s Office continues to move toward independent responsibilities. Before joining the City of Portland, Joshua served as the Senior Business Services Manager at the City of Durham, North Carolina. Prior to that, he served as Finance Director for the City of Chester, South Carolina. Joshua holds a Master’s of Public Administration from Georgia Southern University and a Bachelor’s degree in Mass Communications from the University of South Carolina, Columbia. As a true southerner, the move to Portland is Joshua's first time residing outside of the Southeast region.

Ombudsman Margie Sollinger

Margie Sollinger has served as City Ombudsman since 2012. Before joining the Auditor’s Office, she was a Visiting Associate Professor at Georgetown University Law Center’s Institute for Public Representation, where she practiced environmental, administrative and open government law. Prior to that, Margie clerked on the Maine Supreme Judicial Court and was a housing attorney at Bread for the City, a non-profit social and legal services organization in the District of Columbia. Margie received her undergraduate degree in biology and environmental studies from Carleton College and her law degree from the University of Minnesota Law School.