With a distinguished career spanning public service and private practice, Daniel J. Sullivan, Esq. has established himself as a prominent legal professional in New York. Since 2007, he has been the principal attorney of the Law Offices of Daniel J. Sullivan, Esq., where he manages a robust general practice focused on criminal defense, immigration, real estate, and civil litigation. 

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Mr. Sullivan earned his Juris Doctor on an academic scholarship from Touro College Law Center, where he demonstrated early leadership as President of the Emerald Law Society and as a Student Government Representative. He is currently the President of the Suffolk County Criminal Bar Association for 2025-2026 and serves on the Assigned Counsel Defender Plan’s Felony Panel. 

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Before entering private practice, Mr. Sullivan built an impressive prosecutorial record as a Senior Assistant District Attorney for Suffolk County. During his tenure, he was assigned to several elite bureaus, including the Major Crime Bureau, where he prosecuted high-level felonies, and the Economic Crime Bureau, where he investigated and prosecuted complex white-collar cases. His prosecutorial experience also includes serving as the Village Prosecutor for the Village of Islandia in addition to serving as an appointed Member of the Islip Town Zoning Board of Appeals, where he has adjudicated land use and zoning cases since 2012. He also lends his proficiency to the Suffolk County Attorney’s Office, handling sensitive "Raise the Age" juvenile detention hearings. 

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Mr. Sullivan possesses extensive immigration expertise, enabling him to navigate intricate immigration laws and assist clients with a broad spectrum of matters, including visa applications, green card petitions, naturalization, and deportation defense. His experience spans family-based immigration, employment-based immigration, and humanitarian relief, ensuring comprehensive legal support for individuals and families aspiring to reside and work in the United States.