Lyndon Sommer

Shareholder in St. Louis, MO

Lyndon Sommer, Registered CPA (Ill.), M.Acct., J.D., is a Shareholder of Sandberg Phoenix and member of the firm’s Business Litigation and Products Liability practice groups. He focuses his work in the areas of commercial litigation, professional liability and product liability.

Lyndon specializes in professional negligence cases involving Certified Public Accountants, who he has successfully defended at trial and on appeal. He is experienced in defending accountants in federal court and is very familiar with federal procedure and expert requirements. Throughout his career, he has handled more than 100 professional negligence cases. He has also defended attorneys, architects, engineers and financial advisors in litigation and arbitration.

Lyndon is also experienced in representing shareholders of closely held companies involved in shareholder disputes, and has spent a substantial amount of time representing shareholders in trial courts and arguing several appeals arising out of shareholder litigation. These appeals have been argued in both state and federal courts.

Having tried cases in federal and state courts in Missouri and Illinois, Lyndon has received jury verdicts on behalf of both plaintiffs and defendants. He has also argued multiple cases before the United States Courts of Appeal for the Seventh and Eighth Circuits, as well as the Illinois Appellate Court and Missouri Court of Appeals.


Product, Asbestos & Toxic Tort Liability Professional Liability Commercial Litigation


Accounting Architects & Engineers Brokers / Dealers & Financial Advisors Construction & Development Entrepreneurs, Closely Held & Family Owned Business Lawyers & Law Firms Manufacturing & Distribution Restaurants Transportation Wholesale & Retail Services