Mr Celso Xavier > Demarest Advogados > Sao Paulo, Brazil > Lawyer Profile

Demarest Advogados
SÃO PAULO, SP 05419-001

Work Department

Debt Restructuring, Corporate Reorganization and BankruptcyLitigation and Arbitration




Partner of Demarest’s Litigation and Arbitration and Restructuring and Bankruptcy areas, as well as member of the firm’s Executive Committee, Celso Caldas Martins Xavier holds a master’s degree (LLB) from Stanford Law School (USA) and a Bachelor of Laws from PUC-SP. He concentrates his practice in complex litigation, focusing on contractual disputes, crimes, cartel disputes, product liability and judicial reorganization. He has extensive experience in the banking/investment, construction/engineering, oil & gas, automotive, life sciences, consumer goods and technology segments. He has also served as International Lawyer at Fenwick & West LLP in the United States.


Portuguese, English.


  • Vice-chair of Lex Mundi’s Latin American Dispute Resolution Committee
  • Prosecutor of the Superior Tribunal of Sports Justice (STJ-D)
  • Member of the Council of the Brazilian Bar Association (OAB-SP)
  • Member of the Chamber of Mediation, Conciliation and Arbitration of the Brazilian Bar Association (OAB-SP)
  • Member of the Biotechnology Commission of the Brazilian Bar Association (OAB-SP)
  • Member of the Arbitration Commission of the Brazilian Bar Association (OAB-SP)
  • Member of the Steering Committee of the Arbitration Center of the American Chamber of Commerce (AMCHAM)
  • Member of Lex Mundi’s Product Liability Group
  • Founding Member of the Turnaround Management Association (TMA) in Brazil
  • Member of the International Association of Restructuring, Insolvency and Bankruptcy Professionals (INSOL)


  • Master of Laws (LLB) from Stanford Law School, California, USA (2005)
  • Bachelor of Laws from the Pontifical Catholic University of São Paulo (PUC-SP), São Paulo, Brazil (1999)

Lawyer Rankings

Brazil > Dispute Resolution: Litigation

(Leading individuals)

Celso XavierDemarest Advogados

With a strong network of offices in Brazil, ‘renowned law firmDemarest Advogados has the ability to act for clients from several segments, including energy, pharmaceutical, infrastructure and steel production, in litigation, arbitration and mediation. Corporate disputes, cases involving capital markets, contractual liability and public law issues are key areas of activity for the practice, which is under the joint leadership of Celso XavierMarcelo Inglez de Souza and Rafael Gagliardi. Xavier excels in litigation involving securities, competition law and contractual agreements, while Souza combines a strong dispute resolution and intellectual property practice. Regulatory matters, most notably those involving the energy and infrastructure sectors, are among Gagliardi’s areas of expertise. Since publication, in February 2022, the firm announced the arrival of superior court litigation expert Angela Cignachi Baeta Neves in Brasília.

Brazil > Restructuring and insolvency

Demarest Advogados‘ debtor and creditor clients benefit from the firm’s strong multidisciplinary offering, which includes good support in related litigation, M&A, tax and finance. The firm can often be found advising on some of the more high-profile bankruptcy proceedings to hit the market, a notable recent example being its role as lead Brazilian counsel on LATAM Airlines’ Chapter 11 bankruptcy filed in New York. Another area of strength is the firm’s advice to investors in distressed debt, and to creditors in agribusiness-related restructurings. Celso Xavier and insolvency litigator Guilherme Fontes Bechara jointly lead the well-regarded team.

Brazil > Dispute Resolution: Arbitration

The highly regarded team at Demarest Advogados handles a diverse caseload, which features complex cases before various arbitration centres in Brazil and abroad. The firm’s client roster is made up of large players from several economic sectors, including energy, infrastructure, automotive and life sciences. The department excels in corporate disputes involving M&A transactions, capital markets and corporate control issues, but is also adept at handling cases pertaining to energy, infrastructure and construction contracts. The practice is under the joint leadership of Celso Xavier, Rafael Gagliardi and Marcelo Inglez de Souza. Carlo Verona is predominantly engaged in international arbitration and cross-border disputes.