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Penelope Deihl counsels individuals and corporations in commercial and civil disputes, and she defends professional service providers against allegations of professional liability and malpractice.

Penny is a litigator and negotiator with 30 years of experience representing individuals, corporations, and other entities in a range of commercial and civil disputes. On behalf of her clients, she has argued and won numerous jury awards and judicial decisions in open court.

Penny has developed a significant practice defending professional-services providers against allegations of professional liability and malpractice. She fully understands the financial, reputational, and other impacts of such claims, and brings her full knowledge and experience to bear on behalf of real estate and mortgage brokers, accountants, financial managers, estate planners, insurance brokers, business planners, and other consultants and advisors such as architects and engineers. She provides effective counsel at every step, from helping clients better understand the circumstances that led to the dispute and assess the costs and benefits of various responses, to aggressively pursuing strategies that offer the greatest likelihood of achieving their objectives.

Penny regularly appears in federal and state courts, in settlement negotiations, and in arbitration and mediation, as well as before state and national licensing boards and certification entities, helping clients preserve the credentials necessary to pursue their line of work. She also draws on her experience to develop effective litigation-avoidance strategies that help prevent future conflicts.

In her general litigation practice, Penny has successfully represented Fortune 500 companies, governmental entities, mid-size businesses, startups, business owners, and entrepreneurs in an array of industries — including government tort liability, construction, real estate, engineering, architecture, insurance, and financial services — in multimillion-dollar disputes. Recent client victories include winning favorable jury verdicts while serving as first-chair trial counsel, winning summary judgment on numerous motions, and achieving favorable outcomes in binding arbitration.

Penny is also a licensed real estate broker. Penny previously served as Co-Member-In-Charge of the firm’s Los Angeles office. Penny serves as a member of the firm’s Executive Committee. She is also a Co-Chair of Clark Hill BOLD, the firm’s strategy to promote women within the firm, the legal profession, and the global community.


J.D., Tucson, University of Arizona James E. Rogers College of Law, Tuscon, Arizona, 1993
B.A., Tempe, Arizona State University, Tempe, Arizona, 1989


AV Preeminent Peer Review Rated – Martindale-Hubbell

Real Estate Broker, 2004


Defense Research Institute (DRI) Professional Liability Committee: Seminar Planning Committee (2014); Annual Meeting Chair (2014); Substantive Law Group Vice Chair for Real Estate Professionals (2013-2014) ; Annual Meeting Co-Chair (2013)

Claims & Litigation Management Alliance (CLM): Women’s Forum Steering Committee (2012); Women’s Forum for Annual Conference (2013)

Los Angeles County Bar Association

California Association of Realtors

Building Owners and Managers Association (BOMA) International

Venice Chamber of Commerce (2011-2013)

Federation of Defense & Corporate Counsel

Meals on Wheels-West, Board of Directors

State Bar Licenses


Court Admissions

U.S. District Ct., C.D. of California
Supreme Court of California
  • “This Case Is Killing Me,” For The Defense DRI Newsletter, April 2020
  • Quoted in “Judge tosses suit alleging discrimination in LA market,” Daily Journal, September 12, 2017
  • “What You Didn’t Learn In Law School,” The Voice DRI Newsletter, Volume 6, Issue 3, September 23, 2014
  • Sovereign Immunity, North American Contingency Association (NACA) Annual Conference, May, 2012
  • “Top Ten Mistakes Made By Real Estate Brokers/Agents,” presented to Keller Williams Coastal Properties, Inc., August 2012 and January 2013
  • Bullying & Cyber-Bullying: Preventing & Mitigating Legal Issues, conference for educational institutions co-sponsored by WRM America and Morris Polich & Purdy LLP, San Francisco, April, 2012
  • “Indemnity Agreements: Transferring the Risk,” AIA K-Talk video from Risk Management Best Practices, aecKnowledge continuing education course
  • Trends in Mediation, Claims & Litigation Management Alliance (CLM) Annual Conference, April, 2012
  • Guest Presenter at UCLA School of Architecture on Building Information Management Systems
  • Guest Presenter at USC School of Architecture on Legal Issues Confronting New Architects
  • Multiple Presentations on Express and Equitable Indemnity