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William S. Gillen began his legal career as an Associate at a boutique New York City law firm specializing in estate planning and administration, elder law, special needs planning and real estate transactions. In 2009, William established a private practice focusing on estate planning, probate and estate administration, special needs planning, guardianship and real estate transactions.
His practice also includes serving as a Guardian ad Litem in Surrogate's Court Proceedings and as Court Evaluator and Counsel to Alleged Incapacitated Persons in NYS Supreme Court Guardianship Proceedings. William is Vice President of the Bay Ridge Lawyers Association and is also an active member of the Brooklyn Bar Association, Richmond County Bar Association and New York State Bar Association. He is also an active member of the Rotary Club of Verrazano.
He obtained his law degree from New England Law Boston, where he competed nationally as a member of the Tax Moot Court. During law school, he held internships at the Massachusetts Appellate Tax Board and the Richmond County Surrogate’s Court. William received a B.S. in Accounting from Fordham University. He attended Fordham on a scholarship from J.P. Morgan Chase where he worked in Corporate Tax.
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Practice Areas
19 years
19 years
19 years
19 years
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Chat withState: New York
Acquired: 2008
No misconduct found
State: New Jersey
Acquired: 2007
No misconduct found
440 89th Street, Suite 3A, Brooklyn, NY, 11209
888 Forest Avenue, Staten Island, NY, 10310
29 Client Reviews
Showing 1 - 5 of 14 reviews | Practice Area Knowledge
Posted by Daniel | July 16, 2025 | Real Estate
Reliable and pleasant to work with.
As a real estate broker I have confidently recommended Will Gillen as a go to attorney for my clients without hesitation. Working with Will and Christina ensures a smooth transaction no matter what issues may arise throughout the buying and selling process. Responsive, intelligent, and always with pl...
Posted by Daryl | December 03, 2024 | Hired Attorney | Real Estate
Smooth transaction
Will is very knowledgeable about Brooklyn real estate. He made the buying process easy and fast for this out-of-town buyer.
Posted by anonymous | May 15, 2024 | Hired Attorney | Wills & Living Wills
An excellent lawyer
William Gillen updated my will and established a trust for me. He also handled the change in ownership of my coop apartment to the trust abd advised me about how to handle many issues involved in these changes.
Posted by Sharon | May 01, 2024 | Hired Attorney | Residential
Great real estate attorney
We used Will for closing on the house we sold, and the house we bought. He was extremely helpful and knowledgeable, and always got back to me when I had a question to ask.
Posted by Jake | April 29, 2024 | Hired Attorney | Real Estate
Two time home buyer and seller - Now Good Friend
Will has been a fantastic resource as we worked through both of our home purchases and subsequent sales. Will is extremely diligent, accomplishes tasks quickly, and is always willing to spend time working through complex topics with me. Will is flexible with his time and is always looking fo...
"Outstanding attorney. I endorse this lawyer 100%. William has the perfect blend of professionalism, kindness, and experience. He's driven to going the extra mile and getting the best results for his clients. He's definitely one of the best I know"
Trusts lawyer
2019 - Present
Principal Attorney, The Law Offices of William S. Gillen
2012 - 2019
Partner, Gillen Scali, PLLC
2009 - 2012
Principal Attorney, The Law Offices of William S. Gillen
2011 - Present
Bay Ridge Lawyers AssociationPast President and Board Member
2007
JD - Juris Doctor
2004
BS - Bachelor of Science
English
Legal Answers
In Suffolk County , NY: ( 1) Is an executor of an Estate required by law to answer questions by beneficiaries?
18 May 2014
A property owned by John Doe and Jane Doe, as his wife as shown on the Deed. John Doe, passed away without a last will.
16 May 2014
Should I add my daughter's name to the deed of my home?
21 Apr 2014