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 is a partner at the firm and concentrates his litigation practice on commercial and shareholder disputes, and he also represents clients in certain health care and land use matters.  He has litigated numerous cases involving shareholder and member disputes; fiduciary duties; medical practice breakups; non-compete and non-solicitation agreements; and various business torts.  Mr. Williamson advocates for his clients at all levels, and routinely obtains favorable results in both trial courts and appellate courts.

Drawing from his extensive litigation experience, Mr. Williamson advises clients as to business entity formation and maintenance, and drafts agreements among shareholders, members, or partners that clarify and preserve the parties' rights and responsibilities.  He also represents physicians in credentialing and licensure actions, and assists property owners with land use matters such as the pursuit of variances, special land use approvals, and site plan approvals.      

Mr. Williamson mixes 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.  In 2017 alone, Mr. Williamson’s courtroom and negotiating skills have generated the following successes, among others:

  • A settlement for the defendants on the first day of trial in a shareholder oppression case, in which the plaintiff agreed to immediately drop all claims and surrender his shareholding interest for a price 600% below his demand, payable via installments over several years.
  • Entry of an order securing a $30 million redemption at fair value for non-controlling shareholders of a manufacturing enterprise, after a trial co-chaired with Gerard Mantese;
  • A settlement worth $1.8 million for clients in the medical services field negotiated during pre-suit mediation;
  • Negotiation of a settlement worth approximately $8 million for clients with a claim to ownership rights in a global manufacturing concern;
  • An award of summary disposition in favor of plaintiffs in a referral fee dispute in Oakland County Circuit Court;
  • An award of summary disposition in favor of defendants in litigation against a foreign property development company in Wayne County Circuit Court;
  • An award of summary disposition in favor of a defendant in a business tort action in Macomb County Circuit Court; and
  • Entry of an order preventing a defendant from moving a $50 million business dispute into arbitration against the plaintiff’s wishes.  

Mr. Williamson has garnered high praise and respect from his fellow attorneys, and he routinely receives referrals from (and is hired by) attorneys who have opposed him in 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.  Mr. Williamson routinely re-examines strategies in every case with an eye towards uncovering fresh approaches to achieve his client’s goals.  

A Ferndale resident for more than a decade, Mr. Williamson maintains close ties to his home city, where he serves on the Planning Commission and acts as liaison to the Board of Zoning Appeals.  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:

  • “Super Lawyer,” Michigan Super Lawyers, 2015 - 2017
  • “Rising Star,” Michigan Super Lawyers, 2010-2014

Publications / Presentations