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 1 - 5 of 7 reviews | Family

Posted by Carly | October 26, 2020 | Hired Attorney | Family

Just exceptional

Will has been my saving grace. I went through numerous attorneys and have gotten nowhere settling with my ex in family court. Will is educated, fierce, honest, makes himself available for you, and really cares. He has become more than an attorney to me and I consider him a friend. He has always done... what is in my child and my best interest. He really makes you feel good and that he totally has your back and is on your wide 1220 percent. He has a lot of connections in the court room and court system as well which is really helpful. It doesn’t matter if it’s a weekend or 1am if I have to contact with with an emergency he makes himself available for me and my child. I couldn’t ask for a better attorney and friend and I highly recommend him if you are in family court for any reason at all. We are preparing for trial and I know With Will in my corner I feel confident and prepared and ready to win.

Posted by Yvonne | December 13, 2019 | Hired Attorney | Family

Excellent attorney!!!

No one enjoys this process and you feel a little lost during the whole thing. Luckily we found Mr. Sullivan. I’ve gone to court numerous times for custody and visitation but never felt at ease even with attorneys. Me. Sullivan was very knowledgeable to current laws and his expertise made my experienc...e as painless as possible. Just want to thank Mr. Sullivan and firm for the professionalism, and giving us piece of mind during these difficult times.

Posted by Matthew | September 24, 2018 | Hired Attorney | Family

Best of the Best

Will has been a true savior, guiding me like a true professional and friend during this difficult time. Even when emotions can distract you from the right course of action, Will was there to listen and help me do what was right for my daughter. He has been by myside during all the proceedings and alw...ays available at any time to back me up. He is a true safety blanket that is always one step ahead. He is aggressive and tactful backed up with professionalism and efficiency. Many times he has put my fears to rest after being faced with difficult decisions in this tough tribulation. Will was always been truthful and out for my best interests, clearly exsplaining everything to me and getting the exact results he said he would. Without a doubt, I would want no one else but him in my corner during tough times.

Posted by Wen C. | July 14, 2016 | Hired Attorney | Family

Will Sullivan is an Excellent Lawyer indeed!

Will Sullivan's knowledge and expertise in Family divorce law has helped me through a difficult time. He has been reliable, accessible and aggressive when it was needed and all with a sense of humor at the same time. He's also a true kind-heart man and lawyer that i ever met. I would highly recomm...end Will for representation, he also has an excellent paralegal Lisa Oppici. Thank you again both of you Will and Lisa! i will always appreciate your help and support for my divorce case!

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.

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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  • Experience & background Years licensed, work experience, education
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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