Mark P. Goshko

Zachary counsels clients in pursuing commercially relevant intellectual property protection strategies. He has extensive experience securing patents in areas including life sciences, biotechnology, bioinformatics, pharmaceuticals, semiconductor devices, and optical systems. He assists clients in pursuing effective prosecution strategies. His experience includes drafting and filing patent applications, drafting claims, responding to Office Actions, prosecuting broadening reissue applications, ...

Steven E. Gurdin is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law and Litigation - Trusts and Estates. Steven E., who practices law in Boston, Massachusetts, has been recognized since 2013. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Steven E. is held by other top lawyers in the same geographic and legal practice area.

Lisa R. Haddad is a top attorney recognized by Best Lawyers in the practice area(s) of Corporate Law. Lisa R., who practices law in Boston, Massachusetts, has been recognized since 2023. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Lisa R. is held by other top lawyers in the same geographic and legal practice area.

John Stern is a top attorney recognized by Best Lawyers in the practice area(s) of Tax Law. John, who practices law in Boston, Massachusetts, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which John is held by other top lawyers in the same geographic and legal practice area.

David serves as Managing Partner and is a Tax Partner in Sullivan’s Boston office, bringing over 25 years of experience to his dual roles. Leadership Role As Managing Partner, David collaborates closely with the firm’s Management Committee, partners, and business professionals to advance Sullivan’s vision of becoming a leading global, commercially focused mid-size law firm. He is dedicated to: Cultivating a culture of deep loyalty and high performance Implementing innovative...

Mark DeGiacomo dedicates his practice to working as a Chapter 7 and Chapter 11 bankruptcy trustee while representing clients in bankruptcy cases and commercial litigation matters. Since 1995, Mark has been a valued member of the five-member Boston trustee panel chosen by the Department of Justice to select bankruptcy trustees. He has served as a trustee in numerous cases, acting to operate, sell, and liquidate businesses as needed. In his role as counsel to the bankruptcy estate, Mark brings ...

Phyllis E. Federico is a top attorney recognized by Best Lawyers in the practice area(s) of Family Law. Phyllis E., who practices law in Boston, Massachusetts, has been recognized since 2011. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Phyllis E. is held by other top lawyers in the same geographic and legal practice area.

Gregory Keating is chair of the firm’s Labor Employment & Benefits and Whistleblower Defense Groups. He handles employment litigation, arbitration and administrative cases regarding discrimination, harassment, whistleblowing, non-competition and other post-employment restrictions, ERISA benefits and contract- and tort-based employment claims. In 2012, he was nominated to serve as a management representative on the Whistleblower Protection Advisory Committee by US Senators Michael En...

John P. O’Neill serves as co-chair of the firm's Real Estate Finance Team. He practices primarily in the real estate and real estate finance area. Mr. O’Neill is experienced in representing institutional and international investors, in a variety of investment structures, in the acquisition, financing and disposition of single-and multi-asset pools throughout the country. Mr. O'Neill regularly works with clients in structuring and negotiating joint venture agreements. In addition, ...

Jessica K. Lang is a top attorney recognized by Best Lawyers in the practice area(s) of Immigration Law. Jessica K., who practices law in Boston, Massachusetts, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jessica K. is held by other top lawyers in the same geographic and legal practice area.