O'Reilly, Marsh & Corteselli, P.C.

O'Reilly, Marsh & Corteselli, P.C. is a highly respected, full-service law firm delivering strategic and comprehensive legal solutions to clients across multiple jurisdictions. With a long-standing reputation for excellence, professionalism, and personalized service, the firm serves a diverse client base that includes corporations, entrepreneurs, financial institutions, public sector agencies, and individuals. Headquartered in New York, the firm operates with a global perspective, offering sophisticated counsel to clients navigating today*s complex legal landscape.

Known for its collaborative culture and client-first approach, O'Reilly, Marsh & Corteselli, P.C. consistently delivers effective results by combining deep legal knowledge with practical business insight. The firm*s attorneys are committed to partnering with clients to develop legal strategies that align with their goals and drive long-term success.

Multijurisdictional Expertise

With attorneys admitted in multiple jurisdictions and experience managing cross-border matters, the firm is well-equipped to support clients with operations that extend beyond state or national boundaries. Whether advising on regulatory compliance, international transactions, or multistate litigation, O'Reilly, Marsh & Corteselli ensures clients receive seamless and consistent legal representation tailored to the unique requirements of each matter.

Core Practice Areas

The firm*s services are structured around several core areas of specialization, each designed to address the dynamic legal and business needs of its clients:

Corporate Law: O'Reilly, Marsh & Corteselli offers full-spectrum corporate legal services, including entity formation, mergers and acquisitions, corporate governance, commercial contract negotiation, and regulatory compliance. The firm advises startups, privately held companies, and multinational corporations with equal precision and strategic insight.

Dispute Resolution and Litigation: The firm*s litigation team is experienced in representing clients in complex disputes before state and federal courts, as well as in arbitration and mediation proceedings. Whether handling commercial disputes, professional liability claims, or regulatory matters, the firm is known for its tenacity, attention to detail, and commitment to achieving favorable outcomes.

Intellectual Property: O'Reilly, Marsh & Corteselli helps clients protect, manage, and enforce their intellectual property rights. From trademark and copyright registration to licensing, IP litigation, and strategic portfolio management, the firm ensures that clients* creative assets are safeguarded and positioned for growth in competitive markets.

Cross-Border Transactions: The firm advises on international business transactions, foreign investments, joint ventures, and multinational contract negotiations. With a strong understanding of international law and regional regulatory frameworks, the attorneys at O'Reilly, Marsh & Corteselli help clients execute cross-border deals with clarity, compliance, and confidence.

Commitment to Innovation and Client-Centric Service

O'Reilly, Marsh & Corteselli, P.C. is committed to innovation in both legal strategy and client service. By leveraging technology and modern legal tools, the firm enhances communication, improves workflow efficiency, and delivers better outcomes. This forward-thinking approach allows the firm to stay ahead of legal trends and provide clients with practical, real-time solutions to emerging challenges.

The firm*s client-centric values are evident in every engagement. From initial consultation to final resolution, clients receive personalized attention, transparent communication, and responsive service. The attorneys at O'Reilly, Marsh & Corteselli take the time to understand each client*s goals, industry, and operating environment—ensuring that legal advice is aligned with the client*s broader objectives.

A Diverse and Accomplished Legal Team

The firm*s strength lies in its team of experienced attorneys, each bringing a unique set of skills, perspectives, and legal backgrounds. With a strong emphasis on collaboration, the attorneys at O'Reilly, Marsh & Corteselli work together to deliver comprehensive, multi-dimensional legal strategies. Their collective expertise allows the firm to address even the most complex legal challenges with agility, creativity, and precision.

Conclusion

O'Reilly, Marsh & Corteselli, P.C. is a trusted legal partner for clients seeking strategic, business-savvy, and globally oriented legal representation. With a commitment to excellence, innovation, and client service, the firm delivers legal solutions that support success—whether in the courtroom, boardroom, or across borders. By combining legal knowledge with real-world insight, O'Reilly, Marsh & Corteselli continues to lead with integrity, clarity, and a steadfast focus on client results.

Locations	No. of Attorneys
Mineola, NY	4