Hiddo has experience in public and private healthcare development, health financing and insurance, and social protection, including pensions. He has lived and worked in Asia and the Pacific, Africa, and Europe. Aside from ADB, he has also worked for other institutions and firms, including the European Investment Bank. Hiddo holds a PhD in Behavioural Sciences, an MSc in Econometrics, a bachelor equivalent in Actuarial Sciences, and has certificates in Micro-insurance, Micro-finance, and Health Economics.