Attorneys

Mark A. Siesel — Founder, Trial Lawyer, and Advocate for Injured New Yorkers

One thing our legal team at The Law Office of Mark A. Siesel has noticed is that school does not prepare most people for a serious injury or accident. Most people aren’t taught how to choose a lawyer, how to communicate with insurance companies, or what to do after a serious injury. At their most vulnerable, victims may be relying on insurers or friends and family to tell them what to do, which paves the way for serious mistakes.

At The Law Office of Mark A. Siesel, we often hear the same questions: How do I choose the right lawyer? What do I do next? How do I know if the insurance offer is fair? Do I need a lawyer?

At The Law Office of Mark A. Siesel, we know how stressful this time can be. Injured people need clarity, which is why we have built our law firm around the bedrock of strong communication. We’re always ready to reply quickly to your emails and calls, and we explain your options in plain language, so you understand your next steps. To us, the role of your lawyer is to communicate clearly with you and to be there for you during a difficult time.

Our Law Firm

For almost 40 years, Mark A. Siesel has dedicated his career to representing injured individuals across New York. Through thousands of motor vehicle accidents, premises liability, traumatic brain injury, dog bite, bus, truck, and motorcycle cases, Mark has built a reputation for thorough preparation, strategic case development, results, and compassionate client service. What makes his practice truly different is the relationships he forms with the people he represents. Some former clients stay in touch long after their cases have resolved because they were treated with respect and honesty.

Mark personally handles every case from start to finish. He is deeply involved in investigation, negotiations, depositions, litigation planning, and trial. When you retain him, you get direct access to an attorney who understands the stakes, understands what you’re going through, and works tirelessly to ensure your voice is heard.

We provide a free consultation as well, so if you have been injured and you’re not sure whether you have a claim, reach out to schedule a consultation.

A Legal Career Built on Care and Results

Mark graduated from Brooklyn Law School after completing his undergraduate degree in political science at S.U.N.Y. Stony Brook. Early in his legal career, he worked for law firms that defended personal injury cases. That experience gave him a valuable perspective many plaintiff’s attorneys never gain: insight into how insurance companies think, how their defense lawyers evaluate cases, and how they attempt to minimize payouts.

When he founded The Law Office of Mark A. Siesel, he built his personal injury practice around the knowledge he gained on the defense side. That background informs every strategy, from early case assessment to preparing clients for municipal hearings, depositions, and trial.

Over nearly four decades, Mark has represented people injured in:

Motor vehicle accidents
Bus, truck and motorcycle crashes
TBI and other brain injuries
Premises liability matters, including slip/trip hazards, unsafe stairs, lighting problems, and building code violations
Dog bite cases
Serious injuries caused by unsafe conditions or negligent property maintenance

Each injury type presents different challenges, but Mark approaches every matter with the same careful preparation and attention to detail. He does not rely on templates or assumptions. Instead, he takes the time to understand how the injury affects your day-to-day life, your work, your family, and your long-term health.

What Sets The Law Office of Mark A. Siesel Apart

Almost 40 Years’ Experience Handling Personal Injury Cases

Experience matters, especially when injuries are serious or insurance coverage issues are complex. Mark’s nearly four decades of work in personal injury law gives him a deep understanding of how to investigate, document, negotiate and litigate claims of all sizes.

Personal Attention and Long-Term Client Relationships

Mark is known for forming sincere connections with the people he represents. Many clients stay in contact for years because they appreciate the honesty, responsiveness and support they received. When Mark takes your case, he treats you like a person, not a file.

Communication You Can Count On

Our office responds to phone calls and emails within 24 business hours — and usually the same day. We believe communication is the backbone of trust, and we never leave clients wondering what is happening with their case.

A Strategic Approach to Litigation

In certain parts of New York, juries can be conservative and judges may be skeptical of injury claims. Mark prepares each matter as if it will go to trial, while still recognizing when arbitration, mediation or pre-suit negotiation may offer a better path to resolution.

Understanding the Insurance Industry from the Inside

Mark’s early work for defense firms gives him a competitive advantage. He knows how carriers evaluate cases, when they are likely to negotiate, and what documentation they expect to see before considering fair compensation.

A Focus on Serious Injuries and Complex Accident Claims

Motor Vehicle Crashes

Whether involving cars, commercial trucks, buses, or motorcycles, motor vehicle accidents require fast action and careful documentation. New York’s no-fault system can be confusing for injured people, especially when medical bills start adding up. Mark helps clients understand how no-fault applies, how Section 600 reporting requirements work, and what evidence is needed to establish liability. He also advises clients about the consequences of failing to report an accident — which can be a misdemeanor if the crash caused personal injuries or property damage.

When you are harmed by a driver who was operating under the influence, the civil case intersects with criminal charges such as DWI, DWAI or DWAID. While the firm does not discuss criminal defense on this website, Mark’s understanding of these charges helps him navigate the civil side of impaired-driving injury cases effectively.

Traumatic Brain Injuries and TBI Litigation

TBI cases require a careful combination of medical evidence, expert testimony, and clear documentation of cognitive, physical and emotional changes. Some symptoms appear gradually, which makes close follow-up critical. Mark helps clients work with neurologists, neuropsychologists and other specialists so the full impact of the injury is properly recognized.

Premises Liability and Unsafe Property Conditions

From broken stairs to uneven sidewalks or wet floors, unsafe property conditions can cause life-changing injuries. Mark examines building codes, maintenance records, lighting issues, surveillance footage and witness testimony to determine exactly how and why the hazard occurred.

Dog Bite and Animal Attack Cases

New York’s dog bite laws are unique, and liability often depends on whether the dog had known “vicious propensities.” Mark helps clients document behavior, medical records and local reports to build a clear picture of what happened.

Preparing Clients for Litigation and Insurance Challenges

Many injured people feel anxious about depositions, hearings or trial. Mark’s decades of litigation experience allow him to guide clients through every step so they feel confident and prepared. He explains what to expect, how long processes may take, and how to respond to insurance tactics designed to minimize claims.

Whether a case resolves through negotiation, mediation or trial, the goal is always the same: obtain fair, evidence-based compensation that reflects the full extent of the harm.

Professional Involvement and Community Engagement

Mark maintains an active role in the legal community through:

Westchester County Bar Association
The American Association for Justice
New York State Trial Lawyers Association
New York State Bar Association

He also regularly presents educational lectures and Q&A sessions designed to help attorneys and members of the public better understand personal injury law, trial strategies and New York procedures.

When not practicing law, Mark enjoys tennis, coaching his sons’ sports teams, and playing guitar. These personal interests bring balance to his life and contribute to the calm, grounded way he interacts with clients.

Contact The Law Office of Mark A. Siesel

If you or a loved one has been injured in a motor vehicle crash, a fall caused by unsafe property conditions, a dog bite incident, or another preventable event, you do not have to handle the process alone. With almost 40 years experience and a reputation for personal attention, honesty and responsive communication, Mark A. Siesel is prepared to help you seek fair compensation for your injuries.

Mark A. Siesel

(914) 428-7386

Client Reviews

Mark Siesel represented me in a personal injury case. I was extremely impressed with his work for several reasons. He was very professional, committed and thorough in the entire process. Mark's persistence and compassion reassured me that I was never alone. He completed his work promptly and...

L.A.

Last year, I was in a very bad car accident with a New York City construction truck. I immediately retained Mark Siesel to represent me, as he had previously represented members of my family in other cases with excellent results. Mark handled all aspects of my case thoroughly and aggressively, from...

J.D.

There is no one better than Mark Siesel. He is honest, fair, caring and gets the job done. I felt confident knowing that Mark was representing me. He is a true professional. I would recommend him very highly.

P.A.

Previously my opinion of lawyers was rather jaded and not very respectful. My prior dealings with lawyers before retaining Mark Siesel left me feeling frustrated and defensive. When I had a motor vehicle accident and needed a lawyer, I went to Mark. From the initial visit I had with him, through the...

S.G.

...thanks for the fine job of Mark Siesel on my settlement... everything was handled expeditiously and with intelligence...I was in good hands with Mr. Siesel.

B.B.

When your 19 year old son is in a terrible car accident, one is not thinking of lawyers. We feel very lucky to have Mark be the one that represented us. In a low key way, he guided us through confusing hospital red tape, answered questions and was quickly and consistently available for all our...