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About me

Julia Mezhinsky Jayne is a founding partner of Jayne Law Group, P.C. (formerly, Campbell & Jayne LLP).

Ms. Jayne is an experienced and accomplished trial lawyer who concentrates her practice on both white collar and general criminal defense in felony and misdemeanor cases. She represents a broad array of individuals and small companies in state and federal court, at the investigative, pre-trial, and trial stages. Her successes range from outright case dismissals to extremely favorable plea agreements. Ms. Jayne also has extensive jury trial experience in both state and federal court. Ms. Jayne is committed to making sure each client is satisfied with the result of his/her case. She has handled several newsworthy and high-profile cases.

Her white collar criminal defense matters include prosecutions involving mail and wire fraud violations, securities fraud (insider trading), bank fraud, environmental crimes, money laundering, alien harboring, money smuggling, antitrust, immigration crimes, false statements, identity theft, criminal contempt, tax evasion, and prosecutions with significant asset forfeiture implications.

Ms. Jayne’s experience in general criminal defense runs the gamut — from violent felonies and vehicular manslaughter to drug possession and sales, sexual assault, firearms offenses, juvenile offenses, theft and fraud cases, robbery, burglary, and driving under the influence.

Before founding her own firms, Ms. Jayne served as a Deputy District Attorney in Contra Costa County. There, she tried a variety of misdemeanor, felony, and juvenile cases. In her role as a prosecutor, she filed criminal charges, negotiated thousands of cases, and independently tried over 30 jury trials. After leaving the District Attorney’s Office, Ms. Jayne worked as a civil litigator at Larson • King in San Francisco. Thereafter, Ms. Jayne worked as a white collar criminal defense attorney and civil litigator at Sideman & Bancroft LLP, where she was involved in the representation of several high-profile white collar criminal defense clients.

Ms. Jayne also served as a legal intern to the Organized Crime Strike Force for the Department of Justice, U.S. Attorneys’ Office in San Francisco.  She is also an adjunct professor at U.C. Hastings College of the Law since 2003.


Languages spoken: Russian

Photos and videos

88025 1389653032

Practice areas


  1. Criminal Defense: 60%
    16 years
  2. White Collar Crime: 40%
    16 years



Free consultation (20 minutes)

Payment types:

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Attorney endorsements

7 total 

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  • Decio Cedric Rangel Jr

    Julia Jayne is not only a savvy and knowledgeable litigator, but also shows caring and compassion for her clients. Every client and every case is given the individualized attention needed for a great outcome.


    Decio Rangel Criminal Defense Attorney
    Relationship: Fellow lawyer in community

  • Daniel William Wayne

    Julia is a tenacious criminal defense attorney. She has a wealth of experience and knowledge to draw from. I wouldn't hesitate to refer a client to her for any white collar or other criminal matter.


    Daniel Wayne Landlord & Tenant Attorney
    Relationship: Fellow lawyer in community

Contact info

260 California Street
Suite 1001
San Francisco, CA, 94111


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Superlawyer AwardSuperlawyers2015
Rising StarSuperLawyers2013
Rising StarSuperLawyers2012
Rising StarSuper Lawyers2011
Rising StarSuperLawyers2010
Rising StarSuperLawyers2009
Work experience
TitleCompany nameDuration
PresidentJayne Law Group, P.C.2006 - Present
Adjunct ProfessorU.C. Hastings College Of The Law2003 - Present
AttorneySideman & Bancroft2003 - 2006
Associate AttorneyLarson King LLP2002 - 2003
Deputy District AttorneyContra Costa County District Attorney's Office1999 - 2002
Association namePosition nameDuration
Business Leadership CouncilMember2015 - Present
National Association of Criminal Defense LawyersMember2014 - Present
State Bar of California, Criminal Law SectionAdvisor2013 - Present
State Bar of California, Criminal Law SectionOutgoing Chair2012 - 2013
American Bar AssociationBay Area Women White Collar Defense Attorneys2012 - Present
State Bar of California, Criminal Law SectionExecutive Committee Member2007 - Present
Criminal Justice ActPanel Member2005 - Present
Legal cases
Case nameOutcome
Felony Assault and Possession of Concealed FirearmDismissed at Preliminary Hearing
See all legal cases 
Publication nameTitleDate
Jayne Law Group BlogCase Summaries2013
School nameMajorDegreeGraduated
University of California, Hastings College of the LawN/AN/AN/A
University of California - Los AngelesN/AN/AN/A
Speaking engagements
Conference nameTitleDate
WebinarOpening Statements: Tips of the Trade2014
National Association of Criminal Defense LawyersReverse Engineering: Laying the Seeds for Sentencing from the Very Beginning of the Case2014
State Bar of California, Criminal Law SectionConducting Direct Exam Like a Veteran2013
State Bar of California, Criminal Law SectionDefending Domestic Violence cases2013