Background
Born in a Reformed family in Leeuwarden where his father was working as baker, De Roos started to study Economics at the Netherlands School of Economics in Rotterdam late-1930s.
Born in a Reformed family in Leeuwarden where his father was working as baker, De Roos started to study Economics at the Netherlands School of Economics in Rotterdam late-1930s.
There he received his Master of Arts in 1942, and later in 1949 his Doctor of Philosophy cum laude with a thesis entitled "De algemene banken in Nederland" (The general banks of the Netherlands).
This work would become a seminal work for generations of Dutch students. In 1943 De Roos had started working for the Mees & Zn back in Rotterdam, where he soon became head of the Economic Bureau. After graduation in 1949 he was appointed Professor of Economics at new Department of Economics at the Vrije Universiteit in Amsterdam.
His doctoral student were Dirk Cornelis Renooij (1951), Willem Hessel (1962), Jac Koolschijn (1970), Pieter Van Veen (1970) Wouter Roes (1973), Gerrit Faber (1981), Paul Hilbers (1986) et al.