John O. Mersereau

Senior Counsel

Photo of attorney John Mersereau

Contact Info

Practice Areas

  • Civil Litigation
  • Business Litigation
  • Insurance Law
  • Mass Torts
  • General Litigation
  • Personal Injury
  • Construction Law



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.


  • McGeorge School of Law, University of the Pacific, Sacramento, California

    Bar Admission

    • California


    • SDSU - Dean's List (2001, 2002)

    Professional Associations

    • San Diego County Bar Association, Community Service Committee, Member

    Current Position

    • Senior Counsel