Duane S. Horning

Top rated business litigation attorney in La Mesa, California

California Business Law Group, PC
Duane S. Horning
California Business Law Group, PC

Practice Areas: Business litigation, Estate & trust litigation, Intellectual property litigation; view more

Licensed in California since: 1994

Education: University of San Diego School of Law

Selected to Super Lawyers: 2019 - 2023

California Business Law Group, PC

8170 La Mesa Blvd
La Mesa, CA 91942 Visit website


Duane S. Horning established the California Business Law Group, PC, in 2002 to meet the legal issues faced by the residents of San Diego, California, with an unwavering sense of fairness and professionalism. He assists with a variety of civil litigation matters including business law, intellectual property litigation, real estate law, trust and estate law, and commercial litigation.

A cum laude graduate of Arizona State University, Mr. Horning completed his Bachelor of Science in finance in the year 1981. He obtained his Juris Doctor, magna cum laude, in 1994 from the University of San Diego School of Law, where he served as a member of the San Diego Law Review and was inducted into the Order of the Coif.

First admitted to practice in California in 1994, Mr. Horning is authorized to appear before the United States Supreme Court, the United States Court of Appeals for the Federal Circuit, the United States Court of Appeals for the 9th Circuit as well as the United States District Court for the Southern and Central Districts of California.

Mr. Horning worked at the San Diego Port while studying law during the evenings. He served as an airport manager at the San Diego International Airport and also has experience working as a commercial real estate broker in Arizona. Furthermore, since 2006, he has been an adjunct professor at the University of San Diego School of Law, where he teaches real property transactions and experiential advocacy.

Involved in community activities, Mr. Horning has provided counseling to abused Ukraine children and families and is the lead author of Rescuing Ukrainian Children. He also presented at the American Common Law Center at Taras Shevchenko National University of Kyiv, Ukraine. The San Diego Volunteer Lawyer Program recognized his pro bono efforts and awarded him the Distinguished Service Award.

Appointed as a referee and judge pro tem by the San Diego Superior Court, Mr. Horning has held memberships in the Association of Business Trial Lawyers, the San Diego Intellectual Property Law Association, the Bench-Bar Coalition, the Louis M. Welsh American Inn of Court, the California Lawyers Association, the San Diego Regional Chamber of Commerce and the Federal Bar Association. He is the former co-chair of Rotary International and the director and president of the San Diego County Bar Association.

Practice areas

Business litigation, Estate & trust litigation, Intellectual property litigation, Real estate: business, Civil litigation: plaintiff, Eminent domain

Focus areas

Trade secret, Will contests

  • 20% Business litigation
  • 20% Estate & trust litigation
  • 20% Intellectual property litigation
  • 20% Real estate: business
  • 10% Civil litigation: plaintiff
  • 10% Eminent domain

First Admitted: 1994, California

Professional Webpage: http://www.cblg.biz/team/duane-horning/

Scholarly Lectures/Writings:
  • Rescuing Ukrainian Children
Pro bono/Community Service:
  • Christian Legal Society, San Diego Chapter, Vice President
  • San Diego Regional Chamber of Commerce, Chair of the Legal Committee, Co-Chair of the Housing Committee
  • San Diego Interfaith Housing Foundation, Board Member, Development Committee
  • Rotary International, Downtown San Diego Breakfast Club, Co-Chair, Community Services
  • ProVisors, San Diego
  • Horizon University, Chair of the Board of Trustees
  • Harbor Sailboats Sailing Club
  • Faith Community Church
Bar/Professional Activity:
  • Association of Business Trial Lawyers (ABTL)
  • California Superior Courts, all counties
  • California Courts of Appeal, all Districts
  • California Supreme Court
  • United States District Court, Southern District of California
  • United States District Court, Central District of California
  • United States Court of Appeals for the Ninth Circuit
  • United States Court of Appeals for the Federal Circuit
  • United States Supreme Court
  • San Diego Volunteer Lawyer Program, Distinguished Service Award for pro bono service
  • San Diego Intellectual Property Law Association
  • Louis M. Welsh Inn of Court
  • Federal Bar Association
  • California Lawyers Association
  • Bench Bar Coalition
  • San Diego Count Bar Association Director, Vice President, Treasurer and Chair of the Real Property Section, 2012
Educational Background:
  • Arizona State University, B.S., Finance, Cum Laude, 1981
  • Inductee, Order of the Coif, 1994
  • Graduate, High Honors, 1994
  • Graduate, Magna Cum Laude, 1994
  • Member, San Diego Law Review, 1994
  • Obtained jury verdict of $1.5 million including punitive damages, and defeated counterclaim of $300,000, after four week trial over claims of breach of public works construction subcontract and related claims. Jury’s verdict reduced by court following trial, 2012
  • Obtained favorable settlement of $3.5 million in claim to set aside trust amendment based on claims of undue influence, 2017
  • Defeated patent and trade dress infringement claims by multiple summary judgment motions. Reached confidential settlement while appeal was pending in the Federal Circuit, 2012
  • Favorable settled claim to set aside trust amendment based on claims of undue influence and lack of capacity with clients receiving distribution $1.6 million, 2018
  • Obtained unanimous jury verdict of $19.8 million after five week trial with 38 witnesses over claims of eminent domain, development of a medical office building. Defeated allegations of governmental conflicts of interest. Court awarded client recovery of $2 million in attorneys’ fees. Appeal pending, 2016
  • Defeated claim of trademark infringement by motion to dismiss immediately upon commencement of litigation, 2013
  • Prevailed in binding arbitration on breach of online marketing contract, including award of attorney’s fees, 2015

Office location for Duane S. Horning

8170 La Mesa Blvd
La Mesa, CA 91942

Phone: 619-325-1555


5 Years Super Lawyers
  • Super Lawyers: 2019 - 2023

Additional sources of information about Duane S. Horning

Attorney resources for Duane S. Horning

Page Generated: 0.19096207618713 sec