Mark Thieroff


Mark is a litigator with broad experience in resolving disputes for businesses and individuals throughout Minnesota, both in and out of court.

Much of his practice is focused on solving problems relating to land. There are stalled developments due to contract disputes, delayed land-use permits, and conflicts with adjoining property owners. In other cases there are derailed real-estate transactions due to environmental issues, title defects or zoning problems. Whatever the challenge, Mark's aim is to help the client overcome the legal, political and economic barriers to the project.

Mark also represents business owners and individuals in a variety of commercial litigation, including contract and shareholder disputes, landlord-tenant litigation, and business torts. Whether through mediation, arbitration or the courts, Mark is dedicated to moving his clients' interests forward cost-effectively.

Clients often come from attorney referrals as well as from professionals such as architects and engineers who want to get their clients' projects back on track. Mark calls on the strengths of his experience as well as Siegel Brill's deep knowledge of land use law, Litigation and Dispute Resolution and Real Estate development. The firm also has a long history of representing clients in eminent domain and regulatory takings matters. Contact Mark for a consultation.

Some of Mark's representative cases include:

  • Represented shopping center owner in state district court action to enforce city's obligations under planned unit development agreement. Negotiated favorable settlement that allowed continued expansion of center.
  • Represented investor in downtown Minneapolis condominium project on fraud and breach of contract claims against developer in federal district court.
  • Negotiated favorable settlement following successful motion to amend complaint to add claims and defendants at conclusion of discovery.
  • Represented computer hardware reseller in action against broker employee alleging breach of fiduciary duty, breach of a noncompete agreement and conversion. Obtained favorable jury verdict including award of punitive damages.


University of Minnesota Law School, J.D., 2002, magna cum laude
Yale University, M.A., 1996
University of Miami, B.A., 1992


  • Received peer rating of "AV Preeminent" from Martindale Hubbell for legal ability and ethical standards
  • Volunteer Attorney, The Advocates for Human Rights
  • Appointed by St. Paul Port Authority to the Rock-Tenn Community Advisory Panel, 2007-2008


Bicycle commuter
Urban design
Camping and hiking


Federal Bar Association
Minnesota State Bar Association
Hennepin County Bar Association
U.S. District of Minnesota
U.S. Court of Appeals for the Eighth Circuit