John Dineen

Sheppard, Mullin, Richter & Hampton LLP

$ $$$

West Broadway 501
San Diego 92101 CA US

John C. Dineen is a partner in the Business Trial Practice Group in the Firm’s San Diego (Downtown) office. Mr. Dineen 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, Mr. Dineen has successfully represented clients in numerous real property cases, including quiet title actions, easement disputes, and lease and ownership disputes.

Mr. Dineen 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. Mr. Dineen is the Team Leader of the Firm’s Mortgage Industry Team.

Mr. Dineen 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.

Representative Matters:

  • Represented several national retailers (in separate cases) against class action complaints challenging clients’ gift card policies.
  • 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 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 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.


  • J.D., University of California, Berkeley, 2002, Chair of the Moot Court Board, 2001-2002, Associate Articles Editor, Berkeley Technology Law Journal, 2000-2001
  • B.A., Georgetown University, 1997, magna cum laude, Phi Beta Kappa


  • California
  • U.S. District Court for the Southern District of California
  • U.S. District Court for the Central District of California
  • U.S. District Court for the Northern District of California
  • U.S. District Court for the Eastern District of California
  • U.S. Court of Appeals for the Ninth Circuit


  • 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


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West Broadway 501
San Diego 92101 CA US
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Lina Stillman

Broadway 42
New York 10006 NY US