Skip to main content
M. Brian McMahon

M. Brian McMahon

also known as Brian McMahon

Practice areas:

Antitrust & Trade Law, Litigation, Oil & Gas Law, Environmental and Natural Resources, Utility Law

Share your experience to help future clients.

Review M. Brian McMahon

About Me

Photos and Videos

278168 1306274115

Practice Areas

Licensed since 1978

  1. Utility Law: 20%
  2. Environmental and Natural Resources: 20%
  3. Oil & Gas Law: 20%
  4. Litigation: 20%
  5. Antitrust & Trade Law: 20%

Attorney Endorsements

1 total 

  • 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




Professional Misconduct

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
Solo PractitionerLaw Offices of M. Brian McMahon2002 - Present


Association NamePosition NameDuration
Los Angeles County Bar Association, Antitrust and Unfair Business Practices SectionExecutive Committee, Current President2004 - Present
Pasadena Young Musicians OrchestraVice President Board of Directors & former President2001 - Present
State Bar of CaliforniaMember1978 - Present
Association of Business Trial LawyersMemberN/A
American Philosophical AssociationMemberN/A
Rocky Mountain Mineral Law FoundationMemberN/A

Legal Cases

Case NameOutcome
In re Natural Gas Anti-Trust CasesFavorable Settlement
Long Beach Oil Development Co., v. City of Long BeachAction Dismissed After Summary Judgment
Ampac JV Group, Inc. v. General Motors Corp.Action Dismissed After Summary Judgment

See all Legal Cases 


Publication NameTitleDate
California Antitrust & Unfair Competition in Regulated Industries, IV. Ed. LexisNexis"Antitrust and Unfair Competition in Regulated Industries," Ch. 9, Supplement2011
California Antitrust & Unfair Competition Law, 4th ed., LexisNexis"Antitrust and Unfair Competition in Regulated Industries," Ch. 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