Summary: "International economic law is a branch of public international law. Its sub-fields, however, have taken on the appearance of disconnected specialist subjects over the years ; not least in the world of international legal practice with its Gattologists, Bitologists and sovereign debt workout specialists. In recent decades, the international law on foreign investment especially risked becoming unmoored from sovereign legal relations. Sornarajah, however, always took the classic view of a subject rooted deeply in the sources and systems of public international law