News Flash


Posted on: December 7, 2022

2023 City Council

council 2023

City Council Reorganization

After officially declaring the results of the November 8, 2022 General Municipal Election at its regular December 6 meeting, Diamond Bar City Council held its annual reorganization.

Elected Officials Take Oath of Office

At this reorganization, re-elected Council Members Steve Tye and Andrew Chou, and newly-elected Council Member Chia Yu Teng were sworn into office.

Tye, former at-large council member, was re-elected by District 1 voters. He was first elected to the Diamond Bar City Council in November 2005, and has since been re-elected four times. Prior to joining the Council, Tye was appointed to the Planning Commission four times, serving from 1997-2005, and served on the Parks and Recreation Commission from 1994-1997.

Chou, former at-large council member, was re-elected by District 3 voters. He was first elected to the Diamond Bar City Council in November 2018. Previous to that, he served on the City’s Parks and Recreation Commission.

Teng is newly elected to the Diamond Bar City Council by District 4 voters. He and his wife, Theresa, have lived in Diamond Bar for the past 13 years where they have raised their two children and been active volunteers and supporters of health and education-related causes.

Teng has a doctoral degree in chemistry from Cornell University as well as a Doctor of Medicine from the University of Miami. He has practiced medicine for more than 30 years, and has a clinic in neighboring City of Industry. 

Selection of Mayor, Mayor Pro Tem

Following the swearing-in ceremonies, the newly-elected and re-elected council members joined at-large Council colleagues, Ruth M. Low and Stan Liu, for the selection of mayor and mayor pro tem. The City Council unanimously voted to appoint Andrew Chou as mayor and Stan Liu as mayor pro tem. Both will hold these leadership roles for the next 12 months.

The mayor presides over City Council meetings,  represents the City as the ceremonial head of Diamond Bar City government, and signs all ordinances, resolutions, and contracts approved by the City Council. In the absence of the mayor, the mayor pro tem acts in their place.

City Council, Community Bids Farewell to Retiring Council Member

Also at this reorganization meeting, the City Council, local elected officials, and various community organizations recognized and thanked retired Council Member Nancy A. Lyons for her service.

 Lyons decided not to run for re-election in the November 8 election. She was first elected to the City Council in November 2013, and re-elected in November 2018.

Prior to joining Council, Lyons served two four-year terms on the Walnut Valley Unified School District Board of Trustees, including one term as president. Previous to that, she was an appointed member of the City’s Parks and Recreation Commission.

Related Links

  • Election Results
    For results of the November 8, 2022 General Municipal Election, visit the Los Angeles County Election results website at

  • City Council Biographies and Contact Information
    Complete biographies and contact information for all members of the City Council are available at

  • By-District Election System
    In November 2022, for the first time in Diamond Bar’s history, seats on the City Council that were up for election were filled on a by-district basis rather than by an at-large voting system. Under the by-district system, instead of casting votes to fill all five city council seats, Diamond Bar voters only vote for one City Council candidate living in their district. City Council seats for districts 1, 3, and 4 were up for election in November 2022. Seats in districts 2 and 5 will be up for election in November 2024. To learn why elections for City Council members are now by district, or to find your voting district, visit

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