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120 N. Main Street
Parker, SD 57053
Phone: (605) 297-4446
Fax: (605) 297-4488

Following graduation from the University of South Dakota School of Law in 1973 and a clerkship with the South Dakota Supreme Court, Dennis Duncan joined John Zimmer in the practice of law in 1974.

While the focus of his legal practice was litigation, he also began to serve as a registered lobbyist with the South Dakota Legislature in 1975.  Over the years, the legal practice has evolved to become more focused on representing corporate and individual clients with issues before agencies and departments of the state and federal government and insurance litigation.  A major portion of time is spent advising corporate and individual clients relative to their relations with state government, including procurement, agency rule-making and agency regulation of business and occupational licensing.

Representing the interests of national clients such as the Pharmaceutical Research and Manufacturers of America, Eli Lilly, Verizon Wireless, Allstate Insurance Company, TransCanada Corporation or state-based clients such as Heartland Consumers Power District, South Dakota Association of Mutual Insurance Companies, South Dakota Collectors Association, South Dakota Insurance Alliance, Greenwich Biosciences, the South Dakota Healthcare Association and the University of South Dakota Alumni Association before the South Dakota Legislature has become a major component of Dennis Duncan’s law practice.  Whether it be providing full-time presence for clients during the legislative session or experienced representation before state agencies and departments, Dennis Duncan can provide experienced representation gained by over thirty years of governmental affairs experience.

Firm members are proud to have been chosen for membership in State Law Resources and the National Association of State Lobbyists, prominent national organizations of professional governmental affairs practitioners.

It deems it important to clients to have two (2) experienced lobbyists working for our clients, whether it be in legislature or before a state agency.

Dennis Duncan is a member of the South Dakota State Bar Association, American Bar Association, South Dakota Defense Lawyers Association, National Health Lawyers Association, and Group Health Association of America, and an active member of the South Dakota State Bar having served on the Continuing Education Committee, Medical-Legal Committee, Group Benefits Committee Chairperson and Bar Commissioner, as well as serving as a Director of the University of South Dakota Law School Foundation, and Dean Search Committee for the University of South Dakota School of Law in 1993.


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