John C. Dineen

John C. Dineen: Attorney with Sheppard, Mullin, Richter & Hampton LLP


John Dineen is a partner in the Business Trial Practice Group in the Firm's San Diego (Downtown) office.

Areas of Practice

John is an experienced litigator who represents clients in a variety of business disputes, with a special emphasis on real estate, financial institutions, mortgage banking, lender liability and consumer class action defense.

In particular, John has successfully represented clients in numerous real property cases, including quiet title actions, easement disputes, and lease and ownership disputes.

John has also successfully represented several national banks and mortgage lenders in cases involving claims for lender liability, breach of contract, unfair business practices, fraud, negligence, violations of the Truth-In-Lending Act and Real Estate Settlement Procedures Acts and many other causes of action challenging the origination or servicing of consumer loans. John is the Team Leader of the Firm’s Mortgage Industry Team.

John also has significant experience in defending consumer class action claims, including claims brought under California’s Gift Card Law, the Song-Beverly Credit Card Act, the Telephone Consumer Protection Act, the Consumer Legal Remedies Act, California's Rosenthal Act and other statutory claims. He has extensive experience in all aspects of class action litigation, including coordination proceedings in California courts.



Between April, 2012 and June, 2013 at the height of the mortgage crisis, Mr. Dineen served a secondment in Wells Fargo Bank’s Law Department. In that capacity he handled numerous litigation matters pending in California and other western states, which included managing outside counsel, responding to discovery, working with business teams to develop strategy and counseling the Bank on risk management and compliance with state and federal consumer protection regulations.


•Judicial law clerk to the Honorable William Q. Hayes, United States District Judge for the Southern District of California from November, 2003 to September, 2005


•Constraints On Calif. Credit Card Class Actions
Law360 , June 23, 2011

Financial Institutions Law Blog Posts

• CFPB Prevails On Summary Judgment Against CashCall, Inc., September 2, 2016

Class Action Defense Strategy Law Blog Posts

• In Pineda's Wake, May 24, 2011

Areas of Practice (6)

  • Litigation
  • Class Action Defense
  • Financial Services Litigation
  • Real Estate and Land Use
  • Mortgage Banking
  • Retail

Education & Credentials

Contact Information:
619.338.6609  Phone
619.515.4107  Fax
University Attended:
Georgetown University, B.A., magna cum laude, 1997 Phi Beta Kappa
Law School Attended:
University of California, Berkeley, J.D., 2002 Chair of the Moot Court Board, 2001-2002
Year of First Admission:
U.S. District Court for the Southern District of California; U.S. District Court for the Eastern District of California; U.S. District Court for the Northern District of California; U.S. Court of Appeals for the Ninth Circuit; U.S. District Court for the Central District of California; 2002, California


•Member, Conference on Consumer Finance Law (CCFL)
•Member, Association of Business Trial Lawyers San Diego
•Member, Federal Bar Association
•Member, San Diego County Bar Association
•Member, Welsh Inn of Court, 2007-2009
•Member, Ecology Law Quarterly, 1999-2000

Reported Cases:
Representative Matters : Represented several national retailers (in separate cases) against class action complaints challenging clients' gift card policies.; Represented several national retailers and restaurants (in separate cases) against class action complaints challenging clients' respective credit card policies under the Song-Beverly Credit Card Act and California's unfair competition law.; Represented a national bank with respect to a dispute between several parties involving a sublease of Native American land located in Palm Springs, CA.; Represented a national bank in defense of claims including trespass, malicious prosecution and invasion of privacy relating to a loan secured by a large ranch in Santa Barbara County.; Represented a national bank in defense of a class action complaint filed by a group of property owners in a development in La Jolla, CA related to the construction of the project and certain individual loans secured by individual units in the development.; Represented a San Diego based developer with respect to endangered species act claims that threatened to prevent use of the developer's land.; Represented a subsidiary of a national bank in defense of a class action complaint brought by lessees challenging the insurance provision contained in client's leases for certain commercial/business equipment.; Represented a home owner in a quiet title action involving the use, maintenance and access to a private road in Point Loma section of San Diego.; Represented national storage company in defense of a class action challenging client's practices with respect to noticing rent increases pursuant to its consumer rental contracts.; Represented several national banks with respect to the defense of multiple (separate) lawsuits brought by residential borrower's seeking to modify the terms of their loans and/or to prevent foreclosure following the borrower's default under the terms of the respective loans.; Represented several clients in defense of (separate) complaints asserting alleged violations of the Telephone Consumer Protection Act based on calls made by autodialers and allegedly unsolicited text messages.

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