Missouri Office:
2123 Marconi Ave.
St. Louis, MO 63110
(314) 656-6927

New York Office:
1180 Avenue of the Americas Suite 1920
New York, NY 10036
(212) 401-4008

Michigan Office:
1361 E. Big Beaver Rd.
Troy, MI 48083
(248) 457-9200


Ian M. Williamson

Ian M. Williamson

[email protected]

Ian Williamson joined Mantese Honigman, PC in 2004, and became a partner in 2009.  Drawing on his considerable experience and expertise in shareholder disputes and corporate fiduciary relationships, he represents and advises clients regarding all forms of business disputes, and he also represents clients in certain health care and land use matters. 

Ian mixes creative thinking and innovative strategy with the skillful use of negotiation to effectively represent his clients' interests.  His diplomatic abilities and professionalism, combined with tenacity and a highly effective courtroom demeanor, have resulted in considerable successes for his clients.  Some of Ian's recent representative engagements include the following:

  • Securing full ownership of property valued at $97 million for a client in a highly combative shareholder dispute after nearly a year of intensive dual-track litigation and negotiation, culminating in a marathon 36-hour mediation;

  • Complete trial victory resulting in the entry of an order securing a $30 million redemption at fair value for non-controlling shareholders of a manufacturing enterprise after a trial on value co-chaired with Gerard Mantese;

  • Obtaining a favorable settlement for the defendants on the first day of trial in a shareholder oppression case, in which the plaintiff agreed to dismiss all claims and surrender his shareholding interest for a price 600% below his demand, payable over time without interest;

  • Negotiation of a settlement worth approximately $8 million for clients with a claim to ownership rights in a global manufacturing concern; and

  • Through aggressive and creative litigation, securing a settlement for a 50% shareholder that required the other non-productive 50% shareholder to exit the corporation and surrender his shares at a significantly discounted price.

Ian has garnered high praise and respect from his fellow attorneys, who know that he ethically advocates for his clients with skill, passion, preparation, and a detailed understanding of applicable law.  In fact, Ian routinely receives referrals from (and is hired by) attorneys who have opposed him litigation.  He maintains a pragmatic approach to client engagements that is based on routine and frank communication and a clear understanding of client goals, and he strives in all matters to maximize each client's outcome while minimizing costs.

Ian currently supports the State Bar of Michigan and the legal community through his activities as a member of the Business Law Section's governing council.  A longtime Ferndale resident, Ian maintains close ties to his home city, where he serves as the Chair of the Board of Zoning Appeals and acts as a liaison to the Planning Commission.  Ian is active in his local school community as a Cub Scout Den Leader and parent volunteer, and he is also a regular attender and supporter of Detroit Friends Meeting, a Quaker meeting headquartered in Detroit's Midtown neighborhood.  


J.D., cum laude, Wayne State University Law School, 2004

  • First place: Moot Court Law Day Competition
  • Senior Note Editor, Journal of Law in Society
  • Recipient of Ira J. Spoon writing award
  • Silver Key Certificate for academic excellence

B.A., University of Michigan-Ann Arbor, 1999


  • Michigan
  • Eastern District of Michigan
  • Sixth Circuit Court of Appeals

Awards and Recognitions:

Ian M. Williamson has a long record of outstanding performance:

  • "Leading Lawyer," 2018-2019
  • “Super Lawyer,” Michigan Super Lawyers, 2015 - 2019
  • “Rising Star,” Michigan Super Lawyers, 2010-2014

Publications / Presentations