From 1980 to 1981 , he served as Deputy Managing Director of the Petroleum Corporation of Singapore .
Lee worked at Singapore 's Economic Development Board from 1969 to 1980 , initially as a projects officer before becoming Divisional Director ( Industry ) .
From 1980 to 1981 , Lee served as Deputy Managing Director of the Petroleum Corporation of Singapore .
Lee worked at Singapore 's Economic Development Board from 1969 to 1980 , initially as a projects officer before becoming Divisional Director ( Industry ) .