Mr. Castillo co-authored “Human rights in the contemporary Philippine setting: quis custodiet ipsos custodes?”, a chapter of the Encyclopedia of Public International Law in Asia, which was published by Brill in 2021.
He represented the Philippines in the 2019 ALSA International Investment Arbitration Moot Court Competition in Bangkok, Thailand, where his team won the championship.
Mr. Castillo was recognized for his Exemplary Performance in the 2020/2021 Bar Examinations and was admitted to the Philippine Bar in 2022.
He is a member of the Makati City Chapter of the Integrated Bar of the Philippines and the Young International Council for Commercial Arbitration.