Harris became general director of the Institute of Economic Affairs (IEA) in 1957. He remained in this post until 1988, when he stepped down to become its chairman and was replaced by Graham Mather. Harris was then a founding president of the IEA from 1990 to his death.
In 1957, Harris became general director at the Institute of Economic Affairs (IEA). He held this position until 1988 when he stepped down to become chairman and was replaced by Graham Mather. Afterward, from 1990 until his death, Harris served as a founding president of the IEA.