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 17 reviews | Recommendation

Posted by Kim | August 31, 2017 | Hired Attorney | Lawsuits & Disputes

Saved me

Will saved me from another Attorneys mistakes. Will and his staff are professionals and care about you and your concerns. He negotiates with his clients best interest at heart. He will keep you informed and will always be available to answer your questions. Thank you Will for everything that yo...u have done for me. I highly recommend Will Sullivan and his firm.

Posted by Susan | December 19, 2016 | Hired Attorney | Divorce & Separation

Great litigator, wonderful human being.

Eleven years ago, a friend recommended Will to handle my divorce proceedings. Upon meeting him, I immediately knew I would be in good hands, at a terribly vulnerable point in my life. Will won, what was then, the largest divorce settlement awarded in Suffolk County, and was there for me every st...ep of the way. Now, eleven years later, fighting for a legitimate life insurance claim from a very large insurance company, I needed help. Will's warmth, encouragement, and savvy in the litigation process, led me back to him without hesitation. Once again he delivered, quickly, and with interest! In Will, you are not simply getting a great litigator, you are getting a great man. Sue, Delray Beach, Fl. (formerly Bayport, NY)

Posted by Wen C. | July 14, 2016 | Hired Attorney | Divorce & Separation

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 Stephanie | December 28, 2015 | Hired Attorney | Divorce & Separation

Attorney William Sullivan

I was fortunate to be introduced to attorney William Sullivan by a friend. At the time of our meeting I had gone through a divorce sharing a lawyer with my ex-husband who assured me I would be fairly represented and taken care of. That was not the case. I was at my wits end, worried for both of my... children, myself and our future. Several lawyers advised me nothing could be done to change the stipulations of the agreement. However upon meeting Mr. Sullivan I was made aware that I was not protected and my rights violated. He assured me he could help me and my children and we would be protected under the law. He is an extraordinary individual who makes you feel you are completely protected under his guidance. His integrity and character are beyond exceptional. Will and his staff are always available, communicate promptly and are thorough when explaining any legal processes or terminologies you may question. I have every confidence he always has his client's best interests in mind. I am thankful to have him representing me and would absolutely recommend him to anyone looking for legal representation.

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