David M. Losier - Boston, MA
Attorney at Sheehan Phinney
Business Litigation Lawyers in Boston, MA
28 State Street 22nd Floor Boston, MA 02109
- 1 Super Lawyers®
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34
Years
Experience
Boston Business Litigation Lawyer
Updated: 03/16/2026
Areas of Practice
- Business Litigation
- Government Investigations and White-Collar Criminal Defense
Attorney Information
Overview
David is a member of the firm’s Business Litigation Department where his diverse practice includes complex business litigation and felony criminal matters. He represents individuals and companies in state and federal matters often involving breaches of fiduciary duty, misrepresentation and fraud. Additionally, Dave coordinates and oversees internal corporate investigations. He has successfully represented secondary, college and graduate school students in disciplinary actions brought before school judiciary panels and successfully resolved related criminal cases in a way that facilitates the students’ continued enrollment in the school.
Clients often rely on David for unexpected and emergent personal and business issues that require immediate advice. He recognizes the importance of being responsive, listening, assessing the problem and the client’s concern and assuring the client they are understood and they are not alone. David takes pride in taking on a client’s problem as if it were his own. His clients are often successful individuals at the helm of equally successful businesses. David takes an active and lead role in resolving the problem in a way that allows the client to remain focused on their business or personal endeavors.
“I am a trusted confidant who will tell it to them straight and help clients make informed, albeit sometimes difficult, personal or business decisions. I try to make each client feel as if they are my only client and their case is the most important case I am handling.”
David was a former Middlesex County assistant district attorney for nearly a decade before entering private practice. Prior to Sheehan Phinney, he was a partner at Burns & Levinson.
Awards and Honors
Honors
- Massachusetts Super Lawyers “Rising Star” in 2006.
- Rising Star by Massachusetts Super Lawyers®, Business Litigation & White Collar Crimes
- Martindale-Hubbell, Preeminent Rating
Other Sources of Feedback About David M. Losier
Included on the 2006 Massachusetts Super Lawyers list
Education
-
Legal Education
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Suffolk University Law School,
Boston,
Massachusetts, 1992
J.D.
Honors: cum laude
Honors: Suffolk University Law School, Alumni Mentor
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Suffolk University Law School,
Boston,
Massachusetts, 1992
-
Non Legal Education
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Colby College, 1989
B.S.
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Colby College, 1989
Current Employment Position(s)
-
Shareholder
Past Positions
- Middlesex County, Assistant District Attorney
- Middlesex County, Deputy Director of District Courts
Classes and Seminars
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Criminal Issues in the District and Probate Courts: Where Criminal Law and Family Law Collide, October 10, 2006 - Present
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Criminal Justice Program, December 14, 2009 - Present
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The CSI Effect: Fact or Fiction?, Boston Bar Assocation - Criminal Law Section Event, April 27, 2011 - Present
- Dental Seminar, Avoiding the Pitfalls of Dental Practice Transitions, March 18, 2011 - Present
Pro Bono Activities
- Board of Directors, Project Alliance
- Colby College, Alumni Mentor
- Middlesex Partnership for Youth, past Board Member
- Acton Boxboro Youth Hockey Association, past Board Member and Coach
- Past President of Coach Dante Muzzioli Scholarship Fund, award given to a Belmont High School boys hockey player for hard work and leadership
Published Works
Articles
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USA Patriot Act, White Paper, 2002
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“Reviews of New Instruction on Eyewitness ID Favorable,” Massachusetts Lawyers Weekly, November 2015 (Quoted)
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“Withdrawing guilty pleas: instrument for justice or shopping for sentences?” Boston 25 News, May 2015 (Quoted)
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Jay Severin Show, WTKK, March July 2007, March 2010 (Interview)
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“Slaying Victim Had Fled a Trouble Past,” Boston Globe, November 2004 (Quoted)
- Tracking of web visitors doesn’t trigger jurisdiction (Quoted)
- SJC to weigh Wiretap Act protections for website visitors (Quoted)
Bar Admissions
- Massachusetts, 1992
- U.S. District Court District of Massachusetts
- U.S. Court of Appeals 1st Circuit
Other Affiliations
- Project Alliance (Board of directors)
Reviews
Highlights
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5.0 Value
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5.0 Quality of Service
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5.0 Professional Competence
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Hired Attorney 2025David is an amazing lawyer! He was always easy to reach, explained things in a way I could understand, and made me feel supported the whole time. I could tell he really cared about my case and about me as a person. I'm so grateful for his help and would definitely recommend him to anyone who needs a great lawyer. Thank you, Thank you, Thank you.
Photo
Contact
28 State Street
22nd Floor
Boston, MA 02109
Phone: 603-945-9922
Fax: 617-439-9363
Email: Send a message
Website: https://www.sheehan.com/
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