Colleen C. Cook

Practice Areas



Colleen C. Cook

Colleen C. Cook

Colleen is an accomplished litigator and veteran trial attorney, specializing in civil litigation. She represents both plaintiffs and defendants across a diverse scope of cases, ranging from real estate and leasing disputes to employment issues to contract, construction, and tort matters.

Known for her no-nonsense approach, Colleen serves as a trusted advisor, aiming for the most practical way to efficiently resolve conflict and achieve client goals. Her litigation philosophy combines her competitive spirit with diplomacy, which has resulted in successful outcomes in highly complex as well as routine matters. She has practiced in all tiers of state and federal courts in Massachusetts and has received pro hac vice admission in numerous jurisdictions nationwide. 

Colleen also handles arbitrations, mediation, and administrative law appeals. She has many recognitions, is involved professionally and within the community, and proudly began her career as a law clerk to the Massachusetts Superior Court.




  • Northeastern University School of Law, J.D., 1997
  • University of Vermont, 1992
  • University of Massachusetts, Certification, Women in Politics & Government Program, 1993


  • Massachusetts, 1997
  • United States District Court, District of Massachusetts, 2000
  • First Circuit Court of Appeals, 2000
  • United States Supreme Court, 2008

Representative Experience:

  • Obtained dismissal for Fortune 500 company from lawsuit alleging denial of life insurance Benefits and claims under ERISA
  • Prevailed at trial to establish easement with beach access rights on Cape Cod Bay
  • Had summary judgment affirmed by First Circuit in employer’s favor in case alleging violations of Fair Labor Standards Act, Massachusetts Overtime Act, Massachusetts Wage Act, and Rhode Island Payment of Wages Statute (spotlighted in the National Law Journal and Massachusetts Lawyers Weekly)
  • Won motion to dismiss on statute of limitations grounds in fraud/rescission case
  • Enforced offer to purchase agreement against seller who tried to sell commercial property to another buyer for higher price
  • Won preliminary injunction to keep recycling competitor out of territory
  • Defeated preliminary injunction and lis pendens motions brought by seller against buyers in “seller’s remorse” case
  • Defeated preliminary injunction motion filed by competitor for trademark infringement
  • Won consecutive summary judgment motions in case alleging disability and national origin discrimination and retaliation by terminated employee and narrowed case to one claim that settled before trial
  • Conducted internal investigations of sexual harassment allegations and rendered findings and recommendations
  • Served as Hearing Officer for municipalities in employee disciplinary proceedings  
  • Won motion to dismiss breach of contract claim brought by former independent contractor against an international staffing company on a third-party beneficiary theory
  • Obtained preliminary injunction against former employee in case alleging violation of non-competition provision in employment agreement
  • Leveraged settlement in employer’s favor against former employee for breach of non-competition and non-solicitation obligations with virtually no discovery
  • Successfully negotiated takeover of $12 million line of business for regional staffing company and avoided litigation involving non-solicitation provision

Professional / Community:

  • MCLE Presentations
    • Pretrial Litigation Primer
    • Identifying and Handling Vexatious Litigation
    • Tailoring Your Practice to Thrive Professionally and Personally
  • Past Board Member, Massachusetts Children’s Trust
  • Former Conservation Commissioner
  • Volunteer Judge, Yale University National Moot Court Competition

Awards / Honors:

  • Massachusetts Super Lawyers, 2023
  • Boston Magazine Top Lawyers, 2023
  • Honored by Women’s Business Boston Journal as one of the top 10 lawyers in Massachusetts, New Hampshire, and Rhode Island for her “top-notch legal services and advice”
  • Appointed as Special Assistant Attorney General to defend the Commonwealth of Massachusetts in cases filed concerning the registration of medical marijuana dispensaries and successfully defeated several preliminary injunction motions

We're Excited to Announce!

Sassoon Cymrot Law and Grossman & Associates have joined together into one firm under the Sassoon Cymrot Law name effective May 1, 2021.