Areas of Practice

  • Municipal Law
  • Advisory and Transactional Matters


  • J.D., University of La Verne College of Law, Full Tuition Scholar, 2006
  • B.S., Biology, Psychology, and Communications, Eastern Michigan University, Ypsilanti, Michigan, Summa Cum Laude, 2000


  • Supreme Court of California
  • United States District Court for the Central District and Southern District of California
  • U.S. Court of Appeals, Ninth Circuit

Professional Affiliations

  • State Bar of California
  • California Lawyers Association
  • Asian Pacific American Lawyers of the Inland Empire (Past President)
  • Asian Pacific American Bar Association
  • Delta Theta Phi Law Fraternity
  • University of La Verne College of Law Alumni Association (Past Secretary)


  • California Municipal Law Handbook review team for multiple years

Ms. Koo is a senior associate at Jones Mayer serving as deputy city attorney for the cities of Costa Mesa, Fullerton, La Verne, and Santa Fe Springs, deputy general counsel for the Gateway Cities Counsel of Governments Affordable Housing Trust, and works on various matters for the cities of Encinitas, Gardena, and Lakewood and other public entities throughout California. Prior to joining Jones Mayer in 2023, Ms. Koo served as a senior deputy city attorney at the City of Riverside City Attorney’s office and deputy city attorney at the Los Angeles City Attorney’s office. Before working for local government, she was an associate at Lewis Brisbois Bisgaard & Smith LLP defending government and public agencies in a wide range of issues in litigation, writs, and appeals.

Her primary practice areas are municipal law and transactional matters. Ms. Koo works closely with elected officials and staff in various areas of law, including cybersecurity, technology licenses, cyber breach incident response, service mark registrations, and First Amendment, social media, and communications issues. She provides advice and training on the Brown Act, the Public Records Act, and conflicts of interest. Ms. Koo has advised on and drafted numerous departmental policies and forms, including IT, HR, and city-wide records retention policies, district and JPA formations, resolutions, and ordinances, including appropriations limit (Gann) resolutions, fees and charges resolutions, budget resolutions, and special tax assessment ordinances. Ms. Koo has handled development agreements and related documents for housing authority projects, contracts related to homeless services, and CDBG, HUD, and HOPWA grant funded contracts.

While at the City of Riverside, Ms. Koo worked with most of the departments within the city, including the housing authority, and has advised several city council subcommittees (public safety, finance, and community and economic development), and advisory boards and commissions, including the library board of trustees and the museum board, among others. She advised the Community Police Review Commission and the human resources board for several years in open and closed session meetings where they conduct hearings on grievances by, and complaints against, city employees.

Ms. Koo utilizes her experience to assist multiple cities in drafting ordinances and resolutions, drafting and reviewing contracts, advising on procurements, procurement policies, and ordinances, CUPCCAA, and is nurturing a growing passion for CEQA, planning, and land use law.

In addition to dedicating her entire legal career to public agency representation, Ms. Koo serves her local community as a tutor and mentor to younger students to help them identify career paths through higher education and find scholarship opportunities.

Ms. Koo has dedicated her entire legal career to the representation of counties, cities, districts, public universities, and other public entities in a wide variety of municipal law, transactional matters, and litigation.

Ms. Koo has expertise in technology licenses, cybersecurity and breach response, service mark registrations and license agreements, First Amendment and social media issues, drafting and reviewing contracts, public safety and law enforcement matters, business tax, short-term rentals, and TOT, community facilities districts, business improvement districts, TEFRA hearings, weapons forfeiture matters, government claims review, and DUI cost recovery. She is experienced in drafting a variety of ordinances and resolutions, and provides advice and training on the Brown Act, the Public Records Act (including digitization of documents and streamlining records production), and conflicts of interest. Ms. Koo also has prior experience in parking appeals, code enforcement and livability issues, receiverships, massage parlor regulation, noise ordinances, and unlawful detainers. She currently has a growing passion for land use, CEQA, and planning law.

Ms. Koo brings a collaborative approach and has worked closely with City Managers, City Council Members, Mayors, City Clerks, as well as many directors and staff of the Police, Fire, IT, Finance (including Business Tax, TOT, Debt, Risk), Parks, Recreation & Community Services, Public Works (including Parking Division), Human Resources, Community and Economic (including Code Enforcement Division), and General Services Departments, Communications (including marketing and broadcasting), the Library, and Museum departments, and the Housing Authority. In addition to municipal advisory and transactional matters, she has handled criminal and administrative matters on behalf of local government entities. Ms. Koo has also advised the City Council Subcommittees (Public Safety, Finance, and Community and Economic Development), as well as advisory boards and commissions, such as the Community Police Review Commission, Human Resources Board, the Library Board of Trustees, and the Museum Board, to name a few.

Prior to joining Jones Mayer, Ms. Koo has worked at the City of Riverside City Attorney’s Office where she gained her municipal expertise, the City of Los Angeles City Attorney’s Office, and Lewis Brisbois Bisgaard & Smith LLP where she represented several public agencies in all phases of litigation, including several appeals, in civil rights actions and general liability litigation before state and federal courts.

Ms. Koo is a member of the California State Bar and is admitted to practice before all State of California courts, the United States District Court in the Central and Southern Districts of California, and the United States Court of Appeals for the Ninth Circuit. Ms. Koo served as President of the Asian Pacific American Lawyers of the Inland Empire from 2016-2017 after being a charter member for several years. She has also been a member of several local bar associations throughout her legal career.

Ms. Koo received her JD on a full scholarship from the University of La Verne College of Law. While in law school, she received the Student Bar Association’s Appellate Advocacy Award for best oral argument, as well as the Am. Jur. and Cali Excellence Award in Appellate Advocacy. Ms. Koo also received the Delta Theta Phi Leadership and Community Service Award and the Pro Bono Award for community service. She graduated summa cum laude with a Bachelor of Science from Eastern Michigan University upon completing triple majors in biology, psychology, and communications.

As she has throughout her life, she continues to mentor K-12 students and shares her experience to help disadvantaged students find opportunities for higher education and scholarships.