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About me

I am a trial lawyer with 17 years of experience representing individuals against large corporations, insurance companies, and the government. I have tried over a hundred cases, including trying, and winning, major felony cases, DUI cases, drug cases, and others. 


In addition to my criminal practice, I handle personal injury claims, including wrongful death claims, serious accident cases, truck accidents, car accidents, premises liability, and slip and falls. 


I have collected millions of dollars for my clients in personal injury cases. 


I have represented clients in the District Court, Superior Court, Probate and Family Court, Land Court, Federal District Court, Appeals Court, and Supreme Judicial Court.  




I graduated from University of Pennsylvania with a B.A. in European History, and a minor in Mathematics. I worked in law offices in St. Thomas, USVI and the Philadelphia Water Department before attending Villanova Law School, where I was on the Law Review. I graduated fourth in my class, and won the Rev. Joseph Ullman Award for Excellence in Criminal Law. I was also co-editor of the law school newspaper, and member of the board of The Court Jesters. I was a finalist in the Client Counseling Competition. 


After two years at Philadelphia's Dilworth Paxson, where I  worked with legends Joe Jacovini, Steve Harmelin, and John Latourette, I came to Boston
and formed a partnership with law school classmate Ken Liebman. Six years  later, I founded my own firm. 


I am a Past President (2009 - 2011) and Executive Board Member of the Metrowest Bar Association.  


I was a Trial Practice Advisor for the Harvard Law School Trial Practice Program in the fall of 2010. 


I don't bite (clients). 


Call and talk to me today.


Mark Helwig

Office                                   978 443 3334

Nights and Weekends     508 400 7012


Languages spoken: Spanish, Portuguese

Photos and videos

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Practice areas


  1. Personal Injury: 60%
  2. Criminal Defense: 40%



Contingent (33%), Fixed (sometimes), Free consultation (60 minutes)

Payment types:

Cash, Check, Credit card

Attorney endorsements

5 total 

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  • Christopher Daniel Leroi

    Mr. Helwig is an exceptional attorney. Although I have been practicing law for 24 years as a judge, magistrate, law professor, prosecutor, and private attorney, I learn from his responses on Avvo every time that he posts. If I needed an attorney, I would hire him. I recommend him with no reservation. It would be the best investment of your life to hire him to represent you.


    Christopher Leroi Mediation Attorney
    Relationship: Fellow lawyer in community

  • Ismail Mohammed

    I endorse this lawyer. Attorney Helwig is an excellent attorney who will zealously advocate for his clients.


    Ismail Mohammed Criminal defense Attorney
    Relationship: Fellow lawyer in community

Contact info

Law Office of Mark W. Helwig

323 Boston Post Road
Sudbury, MA, 01776-3022


We have not found any instances of professional misconduct for this lawyer.
Avvo contributions
Legal answers
Award nameGrantorDate granted
Magna Cum LaudeVillanova Law School1993
Order of the CoifVillanova Law School1993
Rev. Joseph Ullman Award for Excellence in Criminal LawVillanova Law School1993
Associate EditorVillanova Law Review1993
Finalist -- Client Counseling CompetitionVillanova Law School1993
Work experience
TitleCompany nameDuration
PrincipalLaw Office of Mark W. Helwig2002 - Present
PartnerLiebman & Helwig, LLP1995 - 2002
AssociateDilworth, Paxson, Kalish & Kauffman1993 - 1995
Association namePosition nameDuration
MetroWest Bar AssociationExecutive Committee2003 - Present
Massachusetts Bar AssociationMemberN/A
MetroWest Bar AssociationPresident2009 - 2011
School nameMajorDegreeGraduated
Villanova University School of LawLawJD - Juris Doctor1993
University of PennsylvaniaN/AN/A1987