We navigate complex legal problems.

The Zeisler law firm litigates commercial and intellectual property disputes and counsels businesses, private funds and individuals in a sophisticated yet cost-effective manner.



We are highly accomplished and experienced lawyers who have particular expertise in complex business and intellectual property matters. We were founded in New York City with a clear vision and goal of achieving superior results for our clients in a responsive and cost-sensitive manner. We build a deep understanding of our clients’ needs and aim to become our clients’ trusted advisors in our areas of expertise. We also serve as outside “in-house” counsel to a number of our corporate and fund clients given our long-standing relationships and knowledge of their businesses and objectives. We take pride in our client relationships.

  • We communicate promptly and concisely.
  • We act as trusted advisors.
  • We craft intelligent and cost-effective legal strategies.
  • We advocate client positions, forcefully and cogently.
  • We try cases.
  • We close deals.


Commercial Litigation

  • Contract Violations
  • Trade Secret Disputes
  • Financial Instruments Litigation
  • Securities Litigation
  • Partnership Disputes
  • Business Torts
  • Breaches of Fiduciary Duty
  • Real Estate Litigation
  • Libel & Slander Claims

Intellectual Property Litigation

  • Trademark Infringement & Dilution
  • Combating Counterfeiting
  • False Advertising
  • Unfair Competition
  • Patent Infringement Enforcement and Defense
  • Patent Inter Partes Review Petition and Defense
  • Pharmaceutical, ANDA and Biosimilars Patent Litigation
  • Copyright Litigation
  • Open Source Licensing Litigation
  • Right of Publicity Disputes
  • TTAB Matters


  • Advice on Tax-Efficient Transactions & Corporate Structures
  • Taxation of Private Equity Transactions
  • Taxation of Foreign Joint Ventures
  • Tax-Free Like-Kind Exchanges of Property
  • Voluntary Offshore Compliance Program Filings
  • Residency Audits
  • Proceedings Before the IRS, NY State, CT State, & U.S. Tax Court

Not-For-Profit & Tax-Exempt Orgs

  • Entity Formation & Obtaining Initial Income Tax Exemptions
  • Business Income Tax Advice
  • Charitable Contributions
  • Tax-Exempt Bond Issuances
  • Compliance With IRS Filing & Reporting Requirements

Employment Law

  • Employment Agreements
  • Non-Competition & Non-Solicitation
  • Employee Benefits
  • Executive Compensation
  • Partnership Duties
  • Discrimination & Retaliation Claims

Insurance Law

  • Coverage Disputes
  • Director & Officer Liability
  • Errors & Omissions, Including Media Liability
  • Coverage Opinions

Intellectual Property Counseling

  • Brand Protection & Anti-Counterfeiting Programs
  • Licensing of IP Rights
  • Drafting of IP Agreements
  • Copyright Issues & Registration
  • TM Name Selection & Investigation
  • TM Registration & Prosecution
  • TM Portfolio Management
  • Patent Portfolio Review
  • Patent Portfolio Construction
  • Patent Application Prosecution
  • Negotiation of Sales of Patents, Copyrights & Other IP Assets
  • Audit of IP Portfolios
  • Expert Testimony

Appellate Practice

  • Federal Appeals – all Circuits & Supreme Court of United States
  • New York Appellate Courts

Alternative Dispute Resolution

  • Arbitration (FINRA, AAA, ICDR)
  • Mediation
  • Neutral Evalutions

Corporate, Fund and Venture Practice

  • Corporate Formation
  • Partnership & LLC Agreements
  • Shareholder Agreements
  • Mergers & Acquisitions
  • Fund Formation
  • Seed Funding
  • Private Placement Memoranda
  • Investment Management Agreements
  • Subscription Agreements
  • Agreements with Prime Brokers, Fund Administrators & Auditors
  • Angel Funding & VC Financing
  • Private Placements
  • Debt Restructuring
  • Corporate Reorganization
  • Corporate Governance

Real Estate

  • Sales & Acquisition of Commercial & Residential Real Estate
  • Sale/Lease-Back Transactions
  • Borrower & Lender Financing
  • Real Estate Partnership Syndications, Joint Ventures & LLCs
  • Board Representation
  • Cooperative & Condominium Conversions
  • Commercial Leasing
  • Ground Leasing


Aaron M. Zeisler, Managing Member

Phone: (917) 410-7712

See Complete Biography link


Meghan H. Sullivan, Partner

Phone: (917) 979-4459

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Daniel B. Ravicher, Partner

Phone: (786) 505-1205

See Complete Biography link


Brian A. Burns, Partner

Phone: (917) 979-2838

See Complete Biography link


Kirk H. O Ferrall, Partner

Phone: (917) 410-7732

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Mark N. Mutterperl, Partner

Phone: (917) 410-7941

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Sumana Wolf, Counsel

Phone: (212) 671-1921

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Steve R. Frankel, Counsel

Phone: (917) 979-5002

See Complete Biography link