In 1964, he moved to the United States, where he was employed by Control Data Corporation in Palo Alto, California until 1966.
In 1972, after a year in Norway, he returned to the UK to establish his own consultancy firm, T. William Olle Associates, specializing in database management applications and information systems methodologies.
He consulted clients in Europe, Australia, and Canada, and presented lectures on database topics around the world.
[6] Olle's research interest in the field of computing started in 1953 at the University of Manchester.
[7] The following is a selection: This article incorporates public domain material from the National Institute of Standards and Technology