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Sigmund J. Roos

Attorney Profile

Top Rated Business Litigation Attorney in Boston, MA

Block & Roos LLP
2 Liberty Square, 11th Floor
Boston, MA 02109
Phone: 617-223-1900
Fax: 617-227-1948
Selected to Super Lawyers: 2005 - 2022
Licensed in Massachusetts Since: 1983
Practice Areas: Business Litigation, Administrative Law, Alternative Dispute Resolution, Professional Liability: Defense, Employment Litigation: Plaintiff, Real Estate: Consumer
Attorney Profile

Attorney Sigmund J. Roos is a founding partner with Block & Roos LLP law firm in Boston, Massachusetts. Widely regarded as among the leading trial lawyers in his region, Mr. Roos provides exceptional counsel and support to clients throughout the greater Boston metro region and all across the state who have legal needs involving any of the following and more:

· Employment litigation and noncompete agreements

· Business litigation and contract disputes

· Legal malpractice

· Medical disciplinary proceedings

· Real estate syndication litigation

· Commercial collections

· Securities litigation

· Shareholder and partnership disputes

· Alternative dispute resolution

Over the course of his legal career spanning more than 37 years, Mr. Roos has gained a reputation for his no-nonsense approach to helping his clients devise the best strategy possible to increase their chances of obtaining the favorable outcomes they seek. He is also known for his outstanding negotiation skills and problem-solving abilities, and he strives to help his clients achieve the positive results they expect and deserve as efficiently and cost-effectively as possible.

Honored for his professionalism and service, Mr. Roos has earned designation as one of the Top 100 Boston Lawyers from Boston Magazine, and he has received perennial top rankings and endorsements from his peers throughout most of his legal career. He has also received numerous testimonials and referrals from his satisfied clients, and he finds great reward in being able to help so many protect and defend what they have worked so hard to achieve.

A 1977 graduate of Hampshire College, Mr. Roos received his Master of Arts in American civilization from Brown University in 1980. He then attended Northeastern University School of Law, where he obtained his Juris Doctor in 1983. He is admitted to practice before the U.S. District Court for the District of Massachusetts and the Northern District of Texas, the U.S. Bankruptcy Court for the Southern District of Texas and the U.S. Court of Appeals for the 1st Circuit.

Practice Areas
  • 20%Business Litigation
  • 20%Administrative Law
  • 20%Alternative Dispute Resolution
  • 20%Professional Liability: Defense
  • 10%Employment Litigation: Plaintiff
  • 10%Real Estate: Consumer
Focus Areas

Legal Malpractice, Employment Law - Employer


18 Years Super Lawyers
  • Super Lawyers: 2005 - 2022

About Sigmund J. Roos

First Admitted: 1983, Massachusetts

Professional Webpage:

Pro bono/Community Service

  • Volunteer, Harvard Law School Trial Advocacy Workshop
  • Board, Concord Art Association in Concord, MA
  • Chair of Board of Trustees, Hampshire College, Amherst, MA, 2008


  • Super Lawyer, Boston Magazine, 2005
  • Top 100 Boston Lawyers, Boston Magazine, 2008

Educational Background

  • Brown University, Providence, Rhode Island, M.A., Major: American Civilization, 1980
  • Hampshire College, Amherst, MA 01002, B.A., Major: Legal Studies and American Civilization, 1977

Bar/Professional Activity

  • U.S. District Court District of Massachusetts, 1984
  • U.S. Bankruptcy Court Southern District of Texas, 1984
  • U.S. District Court Northern District of Texas, 1986
  • U.S. Court of Appeals 1st Circuit, 1986
  • Massachusetts, 1983
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Office Location for Sigmund J. Roos

2 Liberty Square
11th Floor
Boston, MA 02109

Phone: 617-223-1900

Fax: 617-227-1948

Last Updated: 5/15/2022

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