Biography

Daniel R. Sonneborn is a Director in the firm's Litigation Practice Group, working primarily from the firm’s Boston office. A negotiator and litigator, his clients include those in professional services and regulated industries like transportation, insurance, health care, financial services, and construction. Dan’s counsel ranges in focus from professional liability and risk mitigation to multi-jurisdictional class actions. He has developed a particular interest in transportation law, and represents motor carriers, brokers, freight forwarders, and insurance companies in transportation-related matters and litigation, including cargo loss and damage, warehousing, contractual issues, and employment matters.

Despite his upbringing in a family of medical providers, Dan found his professional path in law school, where he was able to combine his generational connection to medicine with his passion for problem-solving. He served as Managing Editor of Suffolk Law’s Journal of Health and Biomedical Law, and continues to advise healthcare professionals to this day. His deep New England roots are reflected in his experience appearing in state and federal courts in Massachusetts, Maine, and New Hampshire.  

Dan lives in Medford, Massachusetts, with his wife and two children.

Professional Activities

  • Massachusetts Defense Lawyers Association
  • Transportation Lawyers Association
  • Conference of Freight Counsel

Honors & Recognition

  • Massachusetts Super Lawyers Rising Star, Transportation/Maritime – 2016 - 2021

Civic and Charitable Activities

  • Coach, Medford Youth Hockey and Baseball

Publications

  • Co-author, Introduction, A Practical Guide to Understanding RSA 358-A in New Hampshire (MCLE New England, 1st Edition, 2014).

Firm Highlights

Press Coverage

Five Major Norwegian Salmon Companies Agree to $85 Million Settlement in Antitrust Case

Preti Flaherty announced today that a Miami federal Court has granted preliminary approval to an $85 million settlement agreement in an antitrust case involving alleged price fixing of farmed salmon sold in the United...

Press Coverage

Court Orders State Police to Reveal More Details About Misconduct by Troopers

Previously concealed records of trooper misconduct by the Maine State Police must be provided in response to public records requests by the press, according to a ruling by Judge William R. Anderson of Penobscot Superior...

Publication

Changes Affecting Employment Authorization for L-2, E, and H-4 Dependent Spouses

On November 12, 2021, USCIS announced that L-2 and E dependent spouses are no longer required to apply for an EAD to work in the United States. Instead, L-2 and E dependent spouses are...

News

Preti Flaherty Files Human Trafficking and Forced Labor Lawsuit Against Church of Scientology

Preti Flaherty attorneys Greg Hansel, Shana Solomon, and Ellie Quinby filed a human trafficking and forced labor lawsuit against the Church of Scientology on behalf of three plaintiffs claiming decades of forced labor, intimidation, coercion...

Press Coverage

Maine State Police Announces Restructuring After 3 Weeks of Declining to Share Details

On June 10, the Maine State Police announced plans to reorganize troop deployment and delegation of manpower in line with revised law enforcement priorities. The announcement follows several weeks of secretive posturing and a lack...

News

Racial Justice Fund Seeks Applications for Second Round of Grants

The Maine Justice Foundation is pleased to announce the second round of grants from the Racial Justice Fund. The Foundation will accept applications for grants of up to $10,000 from June 1-15, 2022. The...

Publication

How Does the Collapse of Roe v. Wade Impact Employer Health Plans?

On June 24, 2022, the U.S. Supreme Court overturned its prior decisions in  Roe v. Wade  and  Planned Parenthood v. Casey , which held that the U.S. Constitution prohibits states from banning abortion or...

Publication

What Are My Options If My H-1B Registration Was Not Selected?

The H-1B nonimmigrant visa category allows employers to sponsor foreign nationals performing work in a “specialty occupation.” This typically requires an offer of employment in a job requiring at least a U.S. bachelor’s degree...

Publication

Primary Round-Up

Primary Round-Up As you are probably aware, primary elections in Maine took place on Tuesday, June 14, and there were a handful that could be significant to the general election outcome in November. Congressional...

News

Sixteen Preti Flaherty Attorneys Selected as Chambers USA Leaders in Their Field

Sixteen Preti Flaherty attorneys and six practice groups have been selected for inclusion in the 2022 Chambers USA Guide to America's Leading Lawyers for Business , the highly regarded directory of leading attorneys and...