Professor Winarta is the Senior Partner and Managing Partner of Frans Winarta & Partners, the Founder and ex-Co-chairman of the Indonesian Chapter of the Chartered Institute of Arbitrators (CIArb), member of the Chartered Institute of Arbitrators (MCIArb), member of the International Court of Arbitration of the International Chamber of Commerce (ICC) in Paris, and Chairman of the Arbitration and ADR Commission of ICC Indonesia. Since 2001, Professor Winarta has been awarded as a Fellow Certified BANI Arbitrator (FCBArb.), given under the seal of the Indonesian National Board of Arbitration (BANI). With a strong academic background and more than 30 (thirty) years of experience as a counsel in the Dispute Resolution practice, which involves various clients from extensive business sectors, he has been numerously entrusted to act as presiding arbitrator, co-arbitrator and expert witness in a number of domestic and international arbitration proceedings under the SIAC, ICC, BANI, UNCITRAL, and KLRCA Rules of Arbitration. Furthermore, he currently sits as member of both national and international arbitration panels, including the BANI, Singapore International Arbitration Centre (SIAC), South China International Economic and Trade Arbitration Commission (SCIA), Hong Kong International Arbitration Centre (HKIAC), Pacific International Arbitration Centre (PIAC), Centre for Arbitration & Consultancy Development (CACD), Kuala Lumpur Regional Centre for Arbitration (KLRCA), and Korean Commercial Arbitration Board (KCAB).

In addition to his widely recognised expertise in the practice of international arbitration, he is also actively involved in numbers of litigation practices, wide-ranging from civil, commercial and criminal matters. He represents clients with various backgrounds before number of courts, from the first instance into the appellate court and cassation level. Due to his experience and participation in arbitration and litigation, he has been accorded with awards and recognitions by legal directories. For the past few years, Professor Winarta has been regularly recognized as a leading individual in Dispute Resolution in Indonesia Jurisdiction by the Legal 500. In addition, he is even rated as the Senior Statesperson in Dispute Resolution by Chambers & Partners.

In addition to his acknowledgement in the Dispute Resolution practices, he has occasionally advised and assisted clients in corporate transactions and intellectual property transactions and registrations.  He has also written numerous articles, chapters and literature on various issues on Indonesian law which have been published in law journals and books, and is an active lecturer who specializes in arbitration and alternative dispute resolution.