Marshall Criminal Defense & DWI Lawyers

Focus and practice areas

Marshall Criminal Defense & DWI Lawyers is a criminal defense firm based in Union, New Jersey. It also goes by The Law Offices of Jonathan F. Marshall. The work is criminal, and the range within that is wide.

The firm handles assault and threat offenses, domestic violence, and drug charges. It takes DWI and DUI cases, fraud related charges, and juvenile offenses. It also covers sex crimes, theft charges, and weapon violations. Municipal court matters and restraining orders round out the list.

That spread tells you something about how the firm is set up. It defends both the serious felony end of the docket and the everyday municipal court end. In my opinion, a client with a single charge benefits when the same firm sees both, because the difference between a Superior Court matter and a municipal one shapes the whole defense.

How the team is built

Jonathan F. Marshall founded the firm in 1999 and is its managing partner. He earned his law degree from Seton Hall University School of Law in 1992 and holds a B.S. from Rider University. His own caseload covers criminal, DWI, domestic violence, juvenile, and traffic matters.

The site names three other attorneys, and each brings a defined focus. Colin Bonus is a senior member of the firm whose practice centers on DWI, DUI, and breath test refusal cases. He is certified on the Draeger Alcotest 7110 breath testing instrument, and he holds certification as an instructor in Standardized Field Sobriety Testing from the National Highway Traffic Safety Administration. He has over thirty years of experience in these matters.

Jason Seidman earned a B.A. in government and law from Lafayette College in 2005 and a J.D. from the University of the District of Columbia in 2009. He began at the Middlesex County Prosecutor's Office as an Assistant Prosecutor, where he oversaw investigations run by county detectives and police officers. That background sits on the other side of the courtroom from where he works now.

Daniel M. Santarsiero is Senior Counsel at the firm. He holds a B.A. from Rutgers, earned in 1989, and a J.D. from New York Law School, earned in 1993. His practice covers personal injury and workers' compensation, and he also handles animal and dog bite cases along with civil rights matters.

Former prosecutors and public defenders

The firm describes several of its attorneys as former county and municipal prosecutors. The team also includes public defenders who have worked across New Jersey. Bonus and Seidman fit that pattern directly, one certified in the science of breath and field testing, the other a former Assistant Prosecutor.

As a reviewer, I read that mix as practical rather than decorative. An attorney who once charged DWI cases knows how the state builds them. That knowledge carries over to the defense.

Where the firm appears

The firm works out of Union County. Its main office is in Union, with additional offices in Elizabeth and Linden. Clients across the county have more than one place to be seen.

On the court side, the firm handles cases at the Union County Superior Court in Elizabeth. It also appears in municipal courts throughout the county. The site names Linden, Roselle Park, Union Township, Clark, and Elizabeth among them.

Naming specific courts is useful for a prospective client. It shows where the attorneys actually stand up rather than a general claim of coverage. A DWI charge in Clark and a felony in Elizabeth follow different paths, and the firm names both settings.

What the record shows

The firm states that its attorneys hold more than 200 years of combined experience. Read that alongside the individual profiles and it lines up. Bonus alone accounts for more than thirty years, and Marshall has practiced since the early 1990s.

Free initial consultations are offered, and the firm can be reached by phone. Beyond those points, the site keeps its claims measured. It lists what the attorneys do and where they trained, and it leaves the marketing quiet.

In my opinion, that restraint works in the firm's favor for a directory like this one. The verifiable facts do the talking: a 1999 founding, named attorneys with stated law schools and admission years, a court list, and a defined book of practice areas. A client can check each of those before making a call.

Who the firm may suit

Someone facing a charge in Union County is the clear fit. The firm covers the full criminal range, from a first DWI stop to a weapons or sex crime case. It also handles restraining orders, which often sit next to a domestic violence charge and need coordinated handling.

The DWI focus deserves a separate mention. With an attorney certified on the specific breath device used in New Jersey testing, the firm can question how a reading was produced. That is a technical defense, and it needs someone trained in the instrument to raise it well.

The firm reads as a criminal defense group with depth in DWI and a bench of attorneys who once worked as prosecutors or public defenders. For a person weighing options in Union County, those are concrete points to start from, and each one can be confirmed against the firm's own pages.