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Patterson Belknap Webb & Tyler LLP

Helen P. O

Helen P. O'Reilly


Patterson Belknap Webb & Tyler LLP
New York, U.S.A.

tel: 212-336-2739
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Helen O’Reilly is an Associate in the Firm’s Litigation department. From 2012 to 2013, Ms. O’Reilly served as a law clerk to the Hon. John Gleeson of the United States District Court for the Eastern District of New York, and from 2011 to 2012, she served as a law clerk to the Hon. Barrington Parker of the United States Court of Appeals for the Second Circuit.

In 2017 and 2018, Ms. O’Reilly was named among the Irish Legal 100. This list, published annually since 2008 by the Irish Voice newspaper, is a compilation of some of the most distinguished and accomplished men and women of Irish heritage in the legal profession in the United States. 

Representative Matters

Advise corporate and not-for-profit clients on employment issues including employment and separation agreements, employee handbooks, independent contractor status, intern status, sexual harassment and misconduct investigations, social media issues, and wage and hour law compliance.

Defend a large transportation company in a putative Fair Labor Standards Act collective action and class action.

Represent leading not-for-profit organizations in internal investigation relating to discrimination and retaliation.

Advise a large educational not-for-profit client on employment implications of business reorganization.

Defend a leading foundation in putative Alien Tort Statute complaint.

Represent financial guaranty insurers in breach of contract and fraud actions concerning residential mortgage-backed securities.

Represent major pharmaceutical company in ANDA litigation, resulting in successful resolution following trial.

Represent large consumer company in Lanham Act litigation against a primary competitor.

Pro Bono
Chair of the Programs Committee on the Task Force on Mass Incarceration at the NYC Bar Association.

Successfully represented a federal inmate in a federal clemency petition.

Represented a Brooklyn resident in federal false arrest and malicious prosecution case.

Represent small not-for-profits in re-drafting employee Handbooks.

Bar Admissions

  • U.S. Court of Appeals, Federal Circuit
  • U.S. District Court, Southern and Eastern Districts of New York
  • New York


  • Yale Law School (J.D., 2011)
    • Editor, Yale Law and Policy Review
    • Paul & Daisy Soros Fellow for New Americans
  • Georgetown University (B.S., magna cum laude, 2003)
Areas of Practice
Professional Career

Professional Activities and Experience

MEMBERSHIPS: New York State Bar Association; Federal Bar Council; New York City Bar Association (Member, Criminal Law Committee); Queens County Bar Association; New York American Inn of Court (2015 – present)


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Patterson Belknap Webb & Tyler LLP 

DataSecurityLaw.com is the firm’s resource for the latest news, analysis, and thought leadership in the critical area of privacy and cybersecurity law. Patterson Belknap’s Privacy and Data Security practice provides public and private enterprises, their leadership teams and boards with...


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