In his 30-year professional career, Mr Mattos has been involved in a variety of legal matters with an emphasis on complex litigation, civil liability, competition law and international trade. He is an active speaker in domestic and international seminars on these matters. Mr Mattos speaks Portuguese, English and Spanish. He has been repeatedly ranked as a leading lawyer in competition and antitrust by Chambers Global - The World Leading Lawyers, and by The International Who's Who of Competition Lawyers. He is also featured in Latin Lawyer - Latin America's Leading Business Law Firms, among others.