John O. Mersereau

Senior Counsel

Our Team
University of the Pacific, McGeorge School of Law -
Connect on Linkedin

John Mersereau joined Morris Sullivan & Lemkul in February 2013, practicing in the areas of personal injury, mass torts, and construction defect litigation. Mr. Mersereau is a seasoned litigator with over a decade of experience handling personal injury and complex civil litigation cases. Mr. Mersereau is uniquely experienced in representing both plaintiffs and defendants through all facets of litigation. Mr. Mersereau is experienced with mediation, binding arbitration, and has tried cases before San Francisco and Alameda County Courts. Mr. Mersereau is praised by his clients for creatively finding solutions for even the most difficult cases and consistently providing exceptional results.

Mr. Mersereau earned a Bachelor of Arts degree from San Diego State University and was named to the Dean’s List in 2001 and 2002. Thereafter, he obtained his Juris Doctor degree from University of Pacific, McGeorge School of Law. Mr. Mersereau is admitted to practice law in all California State Courts and the U.S. District Court, Southern District of California. Mr. Mersereau is a member of the San Diego County Bar Association and is on the Community Service Committee.

Mr. Mersereau is an avid cyclist and is passionate about representing fellow cyclists who have been injured on the road. When away from the office, Mr. Mersereau enjoys road cycling, mountain biking, rock climbing, hiking, and spending time with his family.

Areas of Practice
Civil Litigation

Whether you are facing a legal dispute as the plaintiff...

Business Litigation

Our firm provides business litigation representation...

Insurance Law

MSL handles even the most complex insurance matters...

Mass Torts

The attorneys at Morris, Sullivan & Lemkul have extensive...

General Litigation

The attorneys at Morris, Sullivan & Lemkul have broad...

Personal Injury

Our attorneys have earned a reputation for aggressive...

Construction Law

We assist owners, developers, public entities, general....

San Diego, CA
Learn More

SDSU - Dean's List (2001, 2002)


John is admitted to practice in California.


San Diego County Bar Association, Community Service Committee

Our Offices

Morris Sullivan & Lemkul currently has legal offices in five cities across America with plans to expand to other locations in the near future.


9915 Mira Mesa Boulevard, Suite 300. San Diego, CA 92131


(858) 566-7600

Contact Us
San Diego, CA


    3960 Howard Hughes Parkway, Suite 420. Las Vegas, NV 89169


    (702) 405-8100

    Contact Us
    Las Vegas, NV


      2802 Flintrock Trace, Suite 2011, Austin, Texas 78738


      (512) 566-7336

      Contact Us
      Austin, TX


        1050 Queen Street, Suite 100, Honolulu, HI 96814


        (808) 213-6113

        Contact Us
        Honolulu, HI

          Close Icon
          Contact Us
          We are committed to producing the highest quality work for reasonable and appropriate fees.
          Please don't hesitate to contact us for a free consultation or more information about our services.

          Fill the form for more personalized support:

            Thank you for your message. It has been sent.