Practice Expertise

  • Litigation

Areas of Practice

  • Litigation

WSG Practice Industries


Danielle Mayer is a member of the Litigation Practice Group in the Firm’s Los Angeles and Orange County offices and is the Co-Chair of the firm’s Equine Law Industry Group. Ms. Mayer focuses her practice on civil litigation and dispute resolution. Ms. Mayer has a diverse federal and state court litigation practice, representing clients in class actions and complex commercial disputes, in a wide array of matters involving breach of contract, allegations of fraud and real estate disputes, among others.

Ms. Mayer has extensive experience in complex product liability and personal injury cases, specifically mass tort litigation, and represents clients in matters relating to medical devices, pharmaceutical drugs, and automobiles in state and federal courts.

In addition, Ms. Mayer has experience both prosecuting and defending claims, including jury and bench trials in cases in federal and state court. She is also experienced in managing complicated discovery, taking and defending depositions, arguing motions, and negotiating settlements.

In 2024 Ms. Mayer was recognized as a “Rising Star” by Super Lawyers Magazine.

Equine Law Industry Group

Ms. Mayer, the Co-Chair of the Equine Law Industry Group, advises clients in all aspects of the equestrian industry. Ms. Mayer has curated a team of attorneys at the firm who can handle all the needs of those in the equine industry. These highly skilled attorneys have extensive experience in their given field of expertise and can assist clients from A to Z in the equine industry including business formation, contract drafting, taxation considerations, estate planning, labor and employment, real estate, government law and policy, intellectual property and branding, and even through litigation.

Ms. Mayer’s interest in equine law grew out of a frustrating experience buying a horse. Realizing she would have to draft her own bill of sale, she got to work researching all that goes into a bill of sale, the potential pitfalls, and the potential liabilities that can stem from a poorly drafted contract. This experience really opened her eyes to the large need for lawyers in the equine industry.

The longer Ms. Mayer is involved in equine industry, the more she recognized the need for experienced lawyers that understand the equine industry. After wanting to start an equine legal group at the firm for quite some time, it was not until three other attorneys with extensive equine experience joined Buchalter in the Spring of 2022, that the group became a reality.

Ms. Mayer has advised clients on the purchase, lease, and sale of horses. She has also advised clients on long term horse property leases. Ms. Mayer, with her extensive litigation background, takes her intimate understanding of what can go wrong with contracts related to horses and advises her clients on the best ways to avoid any confusion, misunderstanding, or even litigation. Ms. Mayer’s personal experience buying and selling horses also informs her in her equine law practice. Being involved in the equine industry is invaluable to her clients.

Ms. Mayer is currently on the hunt for a new equine partner in Europe and hopes to do the high amateur owner classes one day with this yet to be discovered unicorn.

Ms. Mayer looks forward to helping everyone in the equine industry to protect their hard work and assets. Lawyers should be involved in horse related deals but these lawyers need to have a personal understanding of the equine industry, the nuances of working with horses, and the special needs of equine related businesses.

Fiduciaries, Receivers, and Trustees

Ms. Mayer has represented state and federal court receivers in the execution of their duties in many equity, real estate, and health & safety receiverships. Ms. Mayer has obtained receivers on behalf of banks, creditors, and other businesses. She also have experience with other pre and post-judgment remedies.

Ms. Mayer also has an interest in artificial intelligence (AI) and autonomous vehicle (AV) transportation, and the ways in which these emerging technologies are changing the world. She has spoken and written on the issues of AV regulation as well as the emerging public policy and regulatory issues related to AV.

Prior to joining Buchalter, Ms. Mayer was an attorney for an international law firm in its Los Angeles offices.

During law school, Ms. Mayer served as a judicial extern for the Honorable James J. Di Cesare in the Superior Court of Orange County in California. She also served as production editor of the Loyola of Los Angeles Law Review and was a member of the Scott Moot Court Honors Board.

Bar Admissions

  • California

Areas of Practice

  • Litigation

Professional Career

Significant Accomplishments
<ul><li>defending a pharmaceutical drug manufacturer in nationwide mass tort litigation</li><li>defending a housing provider in complex class action litigation</li><li>representing real estate developers in breach of contract litigation</li><li>representing a manufacturer in a vessel arrest relating to the damage of cargo during international transport</li><li>defending a European manufacturing company against wrongful death allegations</li><li>defending multiple universities in tuition refund class actions</li><li>representing a Japanese alcohol manufacturer regarding breach of contract disputes</li><li>representing a chemical manufacturing company in employment litigation</li><li>defending corporations in asbestos litigation</li><li>representing an international manufacturer of mobile computers, personal digital assistants (PDAs), and tablets in COVID-19-related breach of contract litigation</li><li>representing a storage company looking to develop property against local city council and the planning commission regarding its decision relating to zoning</li><li>representing a local philanthropic individual in breach of contract dispute related to COVID-19 donations</li><li>representing a parent in a case brought under the Hague Convention on Civil Aspects of International Child Abduction</li><li>representing a wrongfully removed partner in partnership dispute by second chairing a trial in Orange County, California, securing a multimillion-dollar verdict</li></ul>


  • Manufacturer Liability & Autonomous Vehicles
  • Pre-Allocation of AV Risk & Liability

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