Third party funding (TPF), where specialist companies help finance a client's legal fees in exchange for a share of the final award, is becoming increasingly prevalent in international arbitration. This work provides a comprehensive practitioner guide to the law and practice of international arbitration where third party funding is involved, with detailed reference to existing cases, procedural orders, and final awards. The book is comprised of five parts, together covering the life cycle of a funder's involvement in an arbitration: background, case assessment, key terms of the funding agreement, the conduct of the arbitration, and the award. The authors include references to relevant landmark decisions of national courts addressing third-party funding issues in arbitrations, and an appendix provides a list of all known funded investor-state cases, with comprehensive details about the identity of the funder, the dispute, the duration, the cost, and the result. As the discussion of TPF in arbitration continues to be of vital importance in the field, it is imperative that all international arbitration practitioners have access to a balanced, multi-faceted view of the practice and its issues. This book provides much-needed guidance suitable for all practioners and students.