William Michael Sullivan

William Michael Sullivan

4.9
Rating: 10.0

Licensed for 33 years

Family Lawyer at SAYVILLE, NY
Practice Areas: Family, Divorce & Separation, Marriage & Prenuptials

173 NORTH MAIN STREET - SUITE 317, SAYVILLE, NY

About William

Biography

Practice Areas

3

Practice Areas

Fees and Rates

Cost

Hourly Rates

$ 200-495 per hour

Retainer

Always


Payment Methods

  • Cash
  • Check
  • Credit Card

Looking for an attorney? Avvo can help.

search module image

Search our directory

Quickly connect with top attorneys through our legal directory to get help with your legal issue.

chat module image

Avvo's live chat agents can help coordinate a consultation with a local attorney.

Chat with a live agent who can match you with the right attorney for your legal needs.

Chat with

Licenses

Licensed in New York for 33 years

State: New York

Acquired: 1992

Delinquent

No misconduct found

Location

The Law Office of William M. Sullivan

173 NORTH MAIN STREET - SUITE 317, SAYVILLE, NY, 11782

Ad

Transform legal challenges into solutions.

Connect now to review your situation.

The Avvo Rating explained

display-bg

The Avvo Rating explained

William Michael Sullivan's Reviews

Avvo Review Score

4.9 /5.0

33 Client Reviews

Filter Avvo Reviews (33) Refine reviews to match your needs. Use the filters to quickly surface reviews that align with your case or priorities.

Showing 6 - 10 of 11 reviews | General Knowledge

Posted by Randy | April 22, 2015 | Divorce & Separation

Honest, Even When Not in his Self Interest

I came to Mr. Sullivan today seeking a second opinion about the actions of my current divorce attorney, a local country lawyer. Two financial advisers had criticized the guy. So I asked two other local attorneys, who both said that my attorney had made a costly mistake. Sounded pretty damning, but... I had a gut feeling I should check further, since other parts of their advice did not check out. So I got another recommendation from a source I could trust, who pointed me to Mr. Sullivan... for a third second opinion. Mr. Sullivan did NOT try to poach me as a client. Instead, he told me that my local country lawyer had actually done exactly the right thing. He did not try to undermine my confidence in my own attorney, even tho' that might have got him my business, and that was exactly what two other attorney's tried to do. Instead, he explained how the point in question worked in the Suffolk County courts, and why he would have done pretty much the same thing.

Posted by momofjoss | December 02, 2014 | Divorce & Separation

The Right Fit

William Sullivan has always remained the same lawyer I hired him as throughout my 4 year divorce process : Responsive, knowledgable, informative and trustworthy. A lawyer needs to be the right fit for you and your case. Whether you need a lion in the court room, a family man who understands the lov...e you have for your children - Will is also an ethical person who can help you rest peacefully at night knowing you're doing right in this world. William Sullivan will follow your lead as he allows his clients to have a voice. Additionally, his level of expertise lends a calming experience to what can be the most of stressful situations. This among so many other things separates him from the rest.

Posted by Lou | May 12, 2014 | Family

Do you want a lawyer that takes a personal interest AND win your case? Meet Will Sullivan!

I met Will on New Years Eve, about 4 years ago. I retained him to assist on a bogus OOP my ex filed against me. First off I'd like to say one thing that impressed me was his genuine interest in my case, and his availability. It was always easy to reach him and any/all issues, questions and concerns ...were addressed in a timely manner. With his knowledge of family law, he was very reassuring and explained everything in layman's terms. With our first appearance on the OOP case he was able to have it vacated immediately. I was so impressed with not just his knowledge, but with his courtroom mannerisms, that I hired him on 2-3 more cases including a custody case which he helped me win. And with each case he would explain just what needs to be done and how the process works step by step. I would definitely recommend and rehire him if needed. To sum it up, Will Sullivan is an attorney who handles himself professionally in the courtroom, I like to say 'professionally polite'. He can harpoon his adversary in front of a judge without ever raising his voice, he simply allows his knowledge of the law and impeccable timing in presenting his point to shut down the opposition in a professional manner. He is extremely competent with current family law, maintains excellent communication with his clients and truly defends his clients as if they were a member of his personal family. In the past 4 years working with Will, I felt more like a brother/best friend rather then 'just another client or paycheck'. If you want a highly competent attorney that will take your case and handle it like he's personally involved, then you need to meet with Will. I'm sure after meeting with him you will hire him. You will leave his office feeling confident in his ability and professionalism and any stress caused by your current situation, will be greatly reduced after meeting with Will and seeing him in action. Again, I hope to never need his services in the future, but if I do there's no other attorney I would even consider.

Posted by Jeannine | March 11, 2014 | Divorce & Separation

Came highly recommended!

I am a teacher and Will was recommended to me by a wonderful family that knew him on a personal level and also used his services in two of their divorces. Ironically, when I was looking into a divorce attorney, a friend of mine was a Suffolk County District Attorney for many years and it was also th...is office that he recommended. If I remember correctly Will also serves on a board that probably gives him an upper hand as your attorney. He has a great rapport with the judges in the courts and he is very easy to talk to. He is also a dad himself so he gets what it means when you are in something to fight for the rights of your children. He is compassionate yet tough when he needed to be. He is very educated, well spoken and is definitely someone you would feel proud to represent you.

Posted by Beth | March 11, 2014 | Divorce & Separation

Will is the BEST attorney out there!

I hired Will to handle my divorce in 2011 and I must say he was the calm in the storm. His confidence, knowledge and sense of humor helped me get through a difficult time. Will negotiated the divorce while paying attention to every detail so as to protect my future. He is fair, honest and respectabl...e. I was very happy with the agreement Will constructed for me and my children. I have since hired Will again to represent me in a child support matter. His rapport with court officers, his peers and magistrates alike demonstrates a level of character, integrity and professionalism not possessed by many. His staff is caring and efficient. I would, and have, recommended Will to anyone I know who finds themselves in need of an attorney. There has never been a day that I doubted my decision to hire him. I have peace in knowing that my divorce and child support matter have been placed in the right hands.

See All Client Reviews

William Michael Sullivan's Lawyer Endorsements

Endorse William
Somair Syed Alam headshot
Somair Alam

Family lawyer | Feb 13

Relationship: Fellow lawyer in community

"Very knowledgeable family law attorney, dedicated to his clients' success."

Catherine E. Miller headshot
Catherine Miller

Divorce and separation lawyer | Sep 24

Relationship: Fellow lawyer in community

"Ms. Sullivan is highly respected by his colleagues for his professional conduct, intelligence and tenacious representation of his client."

Karen Svendsen headshot
Karen Svendsen

Divorce and separation lawyer | May 15

Relationship: Co-worker

"I endorse this lawyer. Mr. Sullivan is an extremely tough and competent litigator who stops at nothing to pursue the rights of his clients. In addition, Mr. Sullivan has integrity and always treats his clients with the utmost respect and personal attention. I highly recommend this attorney for any Family Law matter."

Ettore A. Simeone headshot
Ettore Simeone

Divorce and separation lawyer | May 12

Relationship: Fellow lawyer in community

"I endorse this lawyer. Will is truly on of the finest attorneys I have ever met in my 32 years of legal practice. He is a wealth of knowledge about any aspect of Family Law and i often call him when I have a complex legal question to get his learned opinion, which I highly respect. He is always willing to assist a colleague. He is highly ethical and competent. I respect him greatly and give him my highest endorsement."

View All Endorsements
Brittany A. Fiorenza Esq. headshot
Brittany Fiorenza

Divorce and separation lawyer

Experience

Rating:  10.0 (Superb)

Honors

2014

Top Attorneys in Long Island, Legal Leaders

1992

Trial Advocacy, Villanova University School of Law

1991

Moot Court Board, Villanova University School of Law

Work Experience

2003 - Present

Partner, Long Tuminello, LLP

2001 - 2003

Managing Partner, William M. Sullivan, P.C.

1992 - 2001

General Counsel/Director of Compliance, AMBAC Financial Services, Inc.

Associations

2014 - 2015

Suffolk County Matrimonial Bar Association

President

2013 - 2014

Suffolk County Matrimonial Bar Association

Vice President

Sample of Legal Cases

O'Loughlin v. Sweetland App Div 2nd Dept. 2009-02720

Appellate Division Reversed

See More Legal Cases

Education

1992

Villanova

JD - Juris Doctor

1987

University of Notre Dame

BBA - Bachelor of Business Administration

Speaking Engagements

2014

Hot Button Topics in Matrimonial and Family Law - November 7, 2014 Hague Convention and Other International Treaties and laws and effects on counseling clients

2010

Matrimonial Boot Camp

Financial Disclosure

Publications

2014

Legal Leaders Legal Leaders: Long Island Top Rated Lawyers

Languages

English

Activity

Avvo Rating

Our Rating is calculated using information the lawyer has included on their profile in addition to the information we collect from state bar associations and other organizations that license legal professionals. Attorneys who claim their profiles and provide Avvo with more information tend to have a higher rating than those who do not.

What determines Avvo Rating?
  • Experience & background Years licensed, work experience, education
  • Legal community recognition Peer endorsements, associations, awards
  • Legal thought leadership Publications, speaking engagements
  • Discipline Disciplinary information may not be comprehensive, or updated. We recommend that you always check a lawyer's disciplinary status with their respective state bar association before hiring them.
Avvo Rating Levels
10.0 - 9.0 Superb8.9 - 8.0 Excellent7.9 - 7.0 Very Good6.9 - 6.0 Good5.9 - 5.0 Average4.9 - 4.0 Concern3.9 - 3.0 Caution2.9 - 2.0 Strong Caution1.9 - 1.0 Extreme Caution