Our Firm

Our Firm

At a Glance

Partners

Every partner of the Firm is a Thompson Reuters “Super Lawyer” or “Rising Star”

Best Law Firms

We have been listed in Best Law Firms in American every year since 2016.

Focus

We concentrate on business disputes – real estate, business owners, insurance coverage and complex commercial disputes.
When your business or property is on the line, you want lawyers who handle that kind of dispute every day. That’s who we are.

We are experienced lawyers who have successfully handled a wide range of conflicts, including shareholder, partnership or trust disputes, contract disputes, fiduciary matters, insurance coverage issues, employment cases, real estate and land use matters, trade secrets and noncompetition agreements, and much more.

We specialize in “commercial litigation,” which means different things to different people, but to us it means advocating for our clients in a business or personal dispute to help them achieve their objectives. Oftentimes litigation requires commencing or defending a lawsuit or arbitration and fighting that case through trial and on appeal. Litigation, however, also can mean resolving a dispute where the benefits of a resolution outweigh the benefits of starting or continuing the lawsuit.

We recognize that commercial litigation does not occur in a vacuum. There is a business behind each dispute and an individual behind each business. We make it a point to understand the business and emotional dynamics of each dispute and pride ourselves on being accessible to our clients. We communicate frequently and clearly with our clients about the costs and risks of litigation, so our clients understand what is happening with their case and can make informed decisions. Client input and communication are essential to any attorney-client relationship. Our passion for what we do, our ability to solve business problems efficiently, and our personalized service set us apart.

Complex
Commercial
Litigation

We represent businesses, large and small, in disputes with their customers, clients, vendors or key employees. We help our clients understand their rights and pursue and defend against claims that affect their business.

Real-Estate &
Construction
Litigation

We advise businesses and individuals in disputes relating to construction projects, commercial leases, purchase and sale agreements, and the wide variety of conflict that can arise with property ownership or land use.

Insurance
Coverage
Disputes

We represent policyholders and injured parties against insurance companies that deny or refuse to pay the fair value of a claim. We bring claims for bad faith claims handling.

Business
Owner
Disputes

We help business owners who end up in disputes with their business partners, including co-founders, officers, directors, investors and lenders.

What Our Clients
Have to Say

OCM represented my organization during a regulatory inquiry with professionalism and expertise. They guided us through a complex discovery process and achieved the desired legal result while keeping our business considerations in mind throughout. The best praise I can give OCM is that we have continued to hire the firm for additional projects. OCM is more than our outside counsel, they are our trusted friends and advisors.
I was fortunate enough to land on the doorstep of OCM at a time when I’d been wronged financially and that damage had bled through all aspects of my life. I spoke with Sean and he told me that while my issue was a little out of their normal practice he felt they could help and bring me closure. The process was long and all through it the lawyers kept me informed and well advised. In the end Sean brought me the closure I needed and assured that the wrongs were righted. I was so fortunate to have them by my side.
I hired Sean Carnathan to provide counsel in an out-of-state LLC ownership dispute and my experience with him was exceptional. His knowledge of corporate law, ability to effectively negotiate, and his realistic advice on the probable outcome of the dispute was invaluable throughout the process. Although litigation is never a pleasant experience, Sean Carnathan’s competence and professionalism led to a favorable result for me. I highly recommend him to anyone who requires representation in litigation involving complex corporate law, both in MA and elsewhere.
David Mack was instrumental in guiding me through what was my first experience with the litigation process. I had an adversarial opponent who became vindictive, yet Dave was always balanced, prepared, and continuously sought a practical, efficacious outcome to the trial. I met and worked with a few of the other lawyers in his office as well and found a similar sense of concern and care from each of them about my situation. It really felt that they were looking out for me personally as much as professionally. I hope not to need litigation again, but if I do, OCM is the only place I’ll be calling.
We have enjoyed working with David Mack for many reasons; even during a stressful situation with a former tenant and difficult lessee, David made us feel confident and that we had viable options for a positive outcome. David and his team made a difficult situation better - by listening to our needs for a desired outcome. And delivering on them. We are thankful for David and his team and would wholeheartedly recommend them!
The team at OCM was amazing through this entire process! Although this entire situation has been beyond hurtful and upsetting, you made it the easiest and least stressful way possible for my family and I! We can't thank you enough for your hard work, professionalism and believing in us.…I'm very happy I listened to my family on fighting this and didn't just walk away like I wanted to. Thank you so much!!
Sean has represented and/or advised me on a wide range of legal matters for over 20 years. Our most significant interactions have focused mostly on employment law, along with a couple commercial and property disputes – but he's also the guy I call anytime someone puts a legal document in front of me. He's smart, articulate and takes a common-sense approach to these matters – which often results in a quick resolution to what could otherwise have been a long (and expensive) process.
Sean has represented and/or advised me on a wide range of legal matters for over 20 years. Our most significant interactions have focused mostly on employment law, along with a couple commercial and property disputes – but he's also the guy I call anytime someone puts a legal document in front of me. He's smart, articulate and takes a common-sense approach to these matters – which often results in a quick resolution to what could otherwise have been a long (and expensive) process.
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Our Team

Meet the people that make up the firm’s rising stars and super lawyers.

Meet Our Team