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Katherine Mayer

Katherine Mayer

also known as Kate Mangan, Kate Mayer Mangan

Practice areas:


Katherine Mayer

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About Me

I handle civil appeals in the California Courts of Appeal and in the Ninth Circuit Court of Appeals.  I have significant appellate experience, including a clerkship on the Ninth Circuit Court of Appeals, experience in en banc proceedings, writs, and other appeals.  I have particular expertise in high stakes business litigation and matters involving public entities.   


Photos and Videos

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Practice Areas

Licensed since 2005

  1. Appeals: 100%



Fixed (Sometimes)

Attorney Endorsements

5 total 

  • Natalie Prescott

    I had a pleasure of working with Kate at Latham & Watkins LLP. She is an excellent attorney who possesses not only great analytical skills but the ability to tackle the most complex matters, often finding solutions that many other attorneys may overlook. She is wonderful to work with, and I am confident that she will continue to provide her clients with the highest quality representation and professionalism for the rest of her legal career!


    Natalie Prescott Car Accidents Attorney
    Relationship: Worked together on matter

  • No photo

    I wholeheartedly endorse this lawyer. I worked extensively with Kate on an appeal before the Ninth Circuit Court of Appeal sitting en banc. She is not just a great lawyer, but a very nice, enjoyable person to be around.


    Jenna Holtzman Litigation Attorney
    Relationship: Worked together on matter

Contact Info

Mayer Mangan, PLC

10755 Scripps Poway Parkway
Suite 367
San Diego, CA, 92131



Professional Misconduct

We have not found any instances of professional misconduct for this lawyer.
Avvo Contributions
Legal Answers
Award NameGrantorDate Granted
Top Young AttorneysSan Diego Daily Transcript2011
Women Who Mean Business FinalistSan Diego Business Journal2011
Wiley W. Manuel Award for Pro Bono Legal ServicesState Bar of California2011
Wiley W. Manuel Award for Pro Bono Legal ServicesState Bar of California2010
Top Young AttorneysSan Diego Daily Transcript2008

Work Experience
TitleCompany NameDuration
Founder & Adjunct Professor, Appellate Litigation ClinicUniversity Of San Diego School Of Law2009 - 2010
AssociateLatham & Watkins, LLP2006 - 2011
Trial AttorneyUs Department Of Justice2005 - 2006
ClerkU.S. Court of Appeals for the Ninth Circuit2004 - 2005

Association NamePosition NameDuration
Appellate Court Committee, San Diego County Bar AssociationChair2012 - Present
Federal Bar Association of San DiegoMember, Executive Committee2009 - 2010
Louis M. Welsh American Inn of CourtAlumni Member2008 - Present
Lawyers Club of San DiegoMember2006 - Present

Legal Cases
Case NameOutcome
Border Business Park v. City of San DiegoPending
Young v. HolderN/A
Czajkowski v. Haskell & White, LLPN/A

See all Legal Cases 

Publication NameTitleDate
San Diego ABTL ReportMaking the Record: Appellate Hints for Trial Lawyers2012
Federal Bar Association newsletter, San Diego chapterHow to Effectively Use Contract Attorneys to Build Your Practice2011
Federal Bar Association newsletter, San Diego chapterThe Ninth Circuit Formulates a 'New' Abuse of Discretion Standard of Review2010
San Diego Daily TranscriptAppellate Attorneys: Why Hire Them and How to Choose Them2009
Georgetown Law JournalAn Unjust War: The Case Against the Government's War on Obesity2005

School NameMajorDegreeGraduated
Georgetown UniversityLawJD - Juris Doctor2004
Pomona College (Claremont)N/ABA - Bachelor of Arts2000

Speaking Engagements
Conference NameTitleDate
San Diego City Attorneys Office SeminarHow to Win an Appeal2008