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Message from CAO
Management Team
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CAO Management Committee

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Helen N. Robbins-Meyer
Chief Administrative Officer

Donald F. Steuer
Assistant CAO/Chief Operating Officer


David Estrella

Community Services Group General Manager

Tracy Sandoval

Finance and General Government Group General Manager

Nick Macchione

Health and Human Services Agency Director


Sarah Aghassi 

Land Use and Environment Group General Manager

Ron Lane

Public Safety Group General Manager

Nicole J. Alejandre

Chief of Staff to the CAO

Mikel Haas

Chief Information Officer

Thomas Montgomery

County Counsel


Geoff Patnoe

Strategy & Inter-
governmental Affairs Director

Susan Brazeau

Human Resources Director