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

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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

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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 14 reviews | Character & Conduct

Posted by Tony | August 26, 2015 | Hired Attorney | Family

Best Family Law Attorney

Will Sullivan is unquestionably the best family law attorney you could possibly hire. I was involved in a custody dispute that began in North Carolina and moved to New York when I was falsely accused by my ex-wife (who resides in New York) of abusing my daughters. After having to fire three differe...nt attorneys in North Carolina before the case moved to New York, I could not have been more pleased that I found Will. You cannot possibly find an attorney who genuinely cares as much as Will, or who works as hard as Will, or who is as smart and talented as Will. I went from being falsely accused and having my parental rights threatened to having custody of my two daughters. It is because of Will that my darkest days led to my brightest days. As I’ve shared with Will numerous times, his genuine caring, tireless hard work and incredibly sharp mind really changed my life in such an amazing way. There’s simply no way that I’d have custody of my two daughters unless I had hired Will. You just cannot make a better choice whatever issues you are facing. He’s truly the best.

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 anonymous | August 10, 2014 | Child Custody

An Amazing Attorney

My wife and I retained Attorney Sullivan after she was served child custody paperwork related to her previous marriage. We are from out of State and were not familiar with New York child custody laws. I work with attorneys on a daily basis and know that there are good attorneys and bad attorneys ou...t there. Because of my background, my initial meeting with him surrounded me finding out whether he is the type of attorney who is only good at motions to the court (and not a good trial attorney), or is he the type of attorney who is a good trial attorney, one who is going to stand up for your rights and not back down before the Judge and the other attorney. Attorney Sullivan immediately put my wife at ease. He fully explained the court process and described in detail what to expect during this trying period in our lives. I reviewed the cross motions and found that Attorney Sullivan was confidant, articulate and extremely well versed in New York Laws. Attorney Sullivan then represented us at the hearings. Here is where many attorney fail. Many attorneys boast about what they can do and what they are going to do at trial, but I have seen many attorneys fall apart. This was not the case. Attorney Sullivan was absolutely amazing. He continued to exude his confidence, his knowledge of New York Laws and then was still able to keep my wife at ease at the same time (and this is no easy matter!!) At the end of this 2 year ordeal (yes, it sometimes takes that long), we ended up winning EVERY motion that was filed before the court. We were not just a number in Attorney Sullivan’s Office. Attorney Sullivan showed kindness and compassion when we needed him the most. Attorney Sullivan showed and proved to us that he was also an amazing trial attorney. Words cannot describe how thankful we are in finding Attorney Sullivan. If you have the opportunity to retain Attorney Sullivan, you are going to be in excellent hands. Thank you Attorney Sullivan!!!

Posted by chris | June 02, 2014 | Divorce & Separation

present client

Will Sullivan's knowledge and expertise in divorce law has helped me through a difficult time. He has been reliable, accessible and aggressive when it was warranted and all with a sense of humor at the same time. I would highly recommend Will for representation, he also has an excellent paralegal L...isa Oppici.

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

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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