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Sean Marco Kneafsey

Intellectual property Attorney at Los Angeles, CA

5.0   2 reviews
  • Licensed for 28 years
    State CA
    Acquired 1995
    Active No misconduct found

We have not found any instances of professional misconduct for this lawyer.

About Sean

Learn Sean’s areas of practice.

Sean M. Kneafsey is the founder of Kneafsey & Friend LLP.

Mr. Kneafsey is an intellectual property, real estate, and general commercial litigator. He has represented both plaintiffs and defendants on a wide variety of complex matters. Mr. Kneafsey has successfully obtained and defended against temporary restraining orders, preliminary injunctions, and has obtained favorable judgments both in arbitration and at trial.


Mr. Kneafsey’s intellectual property experience includes litigating patent, copyright, trademark, and trade secret matters. He is a Past President of the Los Angeles Intellectual Property Association and was previously on the Board of the LAIPLA for eight years.


Mr. Kneafsey’s real estate practice includes litigating partnership, purchase and sale agreement, leasing, and ownership disputes. He also advises clients regarding commercial leases. Mr. Kneafsey served for two years as an adjunct professor of real estate law at Southwestern University School of Law in Los Angeles.


Mr. Kneafsey was previously associated with the nationally recognized law firm of Hennigan, Bennett & Dorman. He maintains a close working relationship with the Hennigan firm, with whom he has acted as co-counsel on a wide variety of matters.


Mr. Kneafsey graduated cum laude from Santa Clara University School of Law where he was in the top 10% of his class. He was Managing Editor of the Santa Clara Law Review, member of the Moot Court Board, received several academic scholarships, and published the comment: The Fourth Amendment Rights Of Probationers: What Remains After Waiving Their Right To Be Free From Unreasonable Searches And Seizures?, 35 Santa Clara L. Rev. 1237 which was cited by the California Supreme Court in People v. Sanders, 31 318, 329, (2003), as well as in numerous treatises on criminal and constitutional law including the Witkin Treatises.


Mr. Kneafsey was previously affiliated with the following firms: Cathcart, Collins & Kneafsey LLP - Partner (2005-2007); Palmer Lombardi Kneafsey & Donohue LLP - Partner (2004 – 2005); Hennigan Bennett & Dorman LLP - Associate (2000 –2003); Hancock, Rothert & Bunshoft - Associate (1997-2000); Gassett, Perry & Frank -Associate (1995 –1997).



  • Southern California Super Lawyer Rising Star 2004, 2005, 2006, 2007, 2008


  • All state and federal courts in California.




  • Past President, Los Angeles Intellectual Property Law Association
  • Association of Business Trial Lawyers
  • Association of Trial Lawyers of America
  • American Intellectual Property Law Association
  • Federal Circuit Bar Association
  • President, Irish American Bar Association
  • Los Angeles County Bar Association, Real Estate Section
  • Past Member of Board of Directors, Santa Clara School of Law Alumni Association




  • The Clergy Cases I, Judicial Council Coordination Proceeding 4286 (The Clergy Cases I, JCCP 4286), which involved over 550 cases filed against the Archdiocese of Los Angeles state-wide, all of which were coordinated in the Los Angeles Superior Court. Mr. Kneafsey was one of the lead attorneys managing and assisting in defense of the Archdiocese of Los Angeles. He was responsible for litigating the majority of the 550 sexual abuse suits filed against the Archdiocese, and was the lead firm on Jaramillo v. Doe One, et al., LASC Case No. BC308295 (JCCP 4286, The Clergy Cases I), the first clergy abuse suit set for trial. The entire Clergy Cases I settlement occurred on the eve of the Jaramillo trial. The Jaramillo matter, as with most other of the Clergy Cases, involved the torts of negligence, negligent hiring, negligent supervision, and fraud, among others.
  • Obtained an over one half million dollar judgment, including punitive damages, in a hotly contested partnership dispute that included successfully defending a $1.1 million counter claim.
  • Successfully represented a small business in a FINRA arbitration involving a complicated hedging transaction used in the sale of the business to a publicly traded company.
  • Obtained a permanent injunction for design patent infringement on behalf of Nike Corporation.
  • Obtained a permanent injunction for copyright infringement on behalf of jewelry manufacturer and designer.
  • Successfully defended an unfair competition and trade secret action against one of the worlds’ largest independent distributor of inductive components.
  • Obtained a TRO and preliminary injunction for trade secret misappropriation of a customer list against a former employee.
  • Obtained a defense verdict in a jury trial involving a real estate dispute.
  • Successfully represented insurance policyholders in actions filed against insurers in property damage, liability, and intellectual property (false advertising) claims.


Sean Marco Kneafsey
800 Wilshire Blvd Ste 710
Los Angeles, CA, 90017

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5.0 / 5.0
  2 customer reviews
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1 Star
Posted by David Lee | January 8, 2019
This review is from a person who hired this attorney.
| Hired Attorney
We hired Sean for a commercial dispute against a tenant. I was really impressed with his ability to resolve the issue quickly and efficiently without delay and unnecessary fees/costs. He was very reliable, diligent and competent. Looking forward to working with him again. I would not hesitate one second to hire him for your commercial disputes especially if it involves litigation.
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Posted by Shawn | September 15, 2014
Sean Kneafsey Review
Sean represented our company in a patent infringment case. We are a small family owned business and a fortune 50 company stole our patented technology. The other side had a huge firm and millions at their disposal. After a long drawn out battle, Sean (And Mark Grossman) got us a multimillion dollar settlement. they have settled 4 more cases in our favor. Sean is professional, knowledgeable and I highly recommend him. Shawn H.
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Contact for Details


AVVO RATING 9.4 (Superb)

Work Experience

  • Attorney
  • Hennigan Bennett & Dorman LLP
  • 2000 - 2003


  • Santa Clara Univ SOL
  • 1990
  • Santa Clara Univ
  • BS - Bachelor of Science
  • 1990


  • Irish American Bar Association of Los Angeles
  • Board of Directors
  • 2003 - Present
  • Los Angeles Intellectual Property Law Association
  • Past President
  • 2009 - 2010
  • Irish American Bar Association of Los Angeles
  • President
  • 2009 - 2010
  • Los Angeles Intellectual Property Law Association
  • President
  • 2008 - 2009
  • Los Angeles Intellectual Property Law Association
  • Board of Directors
  • 2001 - 2010
View all associations

Languages Spoken

  • English

Honors and Awards

  • Super Lawyer
  • Southern California Super Lawyers
  • 2013
  • Southern California Rising Stars
  • Southern California Super Lawyers
  • 2008
  • Southern California Rising Stars
  • Southern California Super Lawyers
  • 2007
  • Southern California Rising Stars
  • Southern California Super Lawyers
  • 2006
  • Southern California Rising Stars
  • Southern California Super Lawyers
  • 2005
  • Southern California Rising Stars
  • Southern California Super Lawyers
  • 2004
  • Southern California Rising Stars
  • Southern California Super Lawyers
  • 2003
  • Dean's List
  • Santa Clara University School of Law
  • 1995
  • Managing Editor
  • Santa Clara County Bar Association
  • 1995
  • Honors Moot Court Board
  • Santa Clara University School of Law
  • 1995
  • Academic Scholorships
  • Santa Clara University School of Law
  • 1994
View all awards

Attorney endorsements

Received (1)
Given (2)
Endorse Sean
Litigation Attorney | Jun 14
Relationship: Worked together on matter
"Sean and I worked on a multi-party case together--we were neither opposed nor aligned. He did a great job. I endorse this lawyer."
Employment and labor

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Los Angeles Intellectual property Lawyer Sean Marco Kneafsey
Sean Marco Kneafsey
Intellectual property Attorney
Los Angeles, CA
Licensed for 28 years