Joanne Mantis is an admiralty and maritime attorney focused on maritime business disputes and financial transactions. Her experience includes charter party disputes, cargo claims, vessel finance and documentation, collisions, allisions, marine casualties, maritime employment, criminal matters (crew homicide) and cargo explosions. 

Joanne represents a variety of clients within the marine industry: vessel owners, operators, managers, brokers, and charterers; logistics providers and offshore companies; terminal facilities, port authorities, and offshore oil and gas interests. She also worked on the BP oil spill litigation representing several governmental entities and reaching favorable settlements.

She advises clients concerning special laws and regulations that affect maritime business and financial transactions, and provides legal counsel in

  • negotiating, structuring, and documenting maritime financial and business transactions, and
  • addressing related tax, regulatory and insurance issues.

She works both domestically and internationally for clients, and has been involved with matters in both state and federal courts, as well as in Greek courts. She is a former City Magistrate Judge for the city of Harahan, Louisiana.

Joanne also represents municipal and government entities in contracts and claims. She is admitted to practice law in Greece, and has been involved with mediation in London and the U.S. A multilingual attorney, in addition to English, Joanne speaks, reads, and writes Greek and is fluent in French. She returned to the firm’s New Orleans office in October of 2011 after working in Athens, Greece, in an affiliate office of the firm.

Joanne was admitted to the Louisiana Bar in 1995 and the Greek Bar in 1999. She graduated from Tulane University Law School in 1994 where she received a certificate in admiralty law. While in law school, she was a member of the Maritime Law Society, and she served as vice president of her senior class. She obtained her Bachelor of Arts from Tulane University in 1991.

Professional & Community Affiliations

  • Athens Bar Association, Greece
  • Federal Bar Association
  • Patrons of Lafreniere Park
  • Louisiana State Bar Association
  • Maritime Law Association of the United States
  • New Orleans Bar Association
  • New Orleans Opera Association Women's Guild, Executive Board Member and Administrative Vice President
  • Propeller Club of New Orleans
  • Women’s International Shipping & Trading Association

"Offshore Winds" Marine & Energy Law Blog Posts


Tulane University Law School, J.D., 1994

Tulane University, B.A., 1991

Bar & Court Admissions

  • Louisiana
  • Greece
  • U.S. District Court, Eastern, Middle and Western Districts of Louisiana
  • U.S. Fifth Circuit Court of Appeals
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