Skip to main content


Not yet reviewed

About me

Photos and videos

278168 1306274115

Practice areas


  1. Oil & Gas: 50%
  2. Antitrust: 40%
  3. Litigation: 10%

Attorney endorsements

1 total 

Are you an attorney? Endorse this lawyer

  • Brian Neal Gurwitz

    I opposed Brian in a complex environmental contamination case. His work was simply outstanding. He is an excellent attorney with the ability to boil complex matters down to their essence in order to advance his client's cause. Brian secured a dismissal in a case that was related to the one we litigated against each another. His briefs were among the most persuasive I've ever read, which is particularly impressive given the complexity and dry subject matter involved. Equally important, Brian is an absolute gentleman. Young lawyers wanting to know how to succeed in representing their clients, while remaining well-liked by their clients and adversaries, would do well to follow his example.


    Brian Gurwitz Criminal defense Attorney
    Relationship: Opposing Counsel on matter

Contact info

Law Offices of M. Brian McMahon

333 S. Hope Street, Suite 4000
Los Angeles, CA, 90071


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
AV RatedMartindale HubbellN/A
Work experience
TitleCompany nameDuration
PrincipalLaw Offices of M. Brian McMahon2002 - Present
PartnerMcMahon and Spiegel1997 - 2000
PartnerHoecker and McMahon1982 - 1996
Associatenationally recognized law firm1979 - 1981
Law ClerkUnited States Court of Appeals, 9th Circuit1978 - 1979
Assistant Professor of PhilosophyUniversity of Wisconsin - Parkside1972 - 1975
Lecturer of PhilosophyUniversity of Wisconsin - Parkside1970 - 1972
Association namePosition nameDuration
Pasadena Symphony and PopsBoard of Directors2015 - Present
National Association of Royalty OwnersMember2009 - Present
Rocky Mountain Mineral Law FoundationMember2006 - Present
Los Angeles County Bar Association, Antitrust and Unfair Business Practices section, Litigation sectionExecutive Committee, Past President2004 - Present
Association of Business Trial LawyersMember2000 - Present
State Bar of California: Antitrust, Unfair Competition & Privacy section, Litigation sectionMember1978 - Present
American Philosophical AssociationMember1968 - Present
Pasadena Young Musicians OrchestraPresident and Vice President2001 - 2013
Legal cases
Case nameOutcome
Long Beach Oil Development Co., v. City of Long BeachAction Dismissed After Summary Judgment
In re Natural Gas Anti-Trust CasesFavorable Settlement
Ampac JV Group, Inc. v. General Motors Corp.Summary Judgment Reversed
See all legal cases 
Publication nameTitleDate
California State Antitrust & Unfair Competition, 4th Ed."Regulated Industries," Ch. 9, updates 2011-20142015
California State Antitrust & Unfair Competition, 4th Ed."Regulated Industries" Chapter 92009
Competition, The Journal of the Antitrust and Unfair Competition Section of the State Bar of California, Vol. 16, No. 2, Fall/Winter 2007Tying Law: The Clash Between the Supreme Court and Lower Courts2007
School nameMajorDegreeGraduated
University of California at Los Angeles School of LawLawJD - Juris Doctor1978
University of Wisconsin, MadisonPhilosophyPhD - Doctorate1972
Speaking engagements
Conference nameTitleDate
Southern California Monte Jade Science and Technology AssociationHow to Avoid Prison, Fines and Damage Awards for Violations of the Antitrust Laws2011
Los Angeles County Bar Association, Antitrust Section"Clayworth v Pfizer" panel moderator2011
USC School of Law, Antitrust CoursePredatory Pricing2010
Agreements and Disputes in Oil and Gas ProductionCrude Oil and Natural Gas Royalties2010
Los Angeles County Bar Association, Antitrust Section"At Sword's Point-Emerging Issues in the Interface of Intellectual Property, New Technology and Antitrust" panel moderator2008
Los Angeles County Bar Association, Antitrust SectionNatural Gas Anti-Trust Cases: A Perspective from the Participants2007
US Senate: Energy and Natural Resources CommitteeCrude Oil Pricing2001
Western States Lands Commission MeetingOil & Gas Law1999
US Senate: Energy & Mineral Resources SubcommitteeCrude Oil Pricing1998
US House of Representatives: Mineral Management Services MeetingCrude Oil Pricing1998
Interstate Oil & Gas Compact Comission, Royalty-In-Kind WorkshopOil & Gas Royalty1998
California Independent Producers AssociationOil & Gas Law1998
US House of Representatives: Government Reform and Oversight CommitteeCrude Oil Pricing1996
Natural Stripper Well AssociationIs There A Future For Posted Prices?1995
Western and Eastern States Lands Commission MeetingOil & Gas1991
Hearing before the United States House of RepresentativesCrude Oil Pricing and RoyaltiesN/A