LEO Computers

  • Gerard O’Regan


The LEO I computer was one of the earliest business computers, and it was developed by J. Lyons and Co. It was modeled on the Cambridge EDSAC computer, which was designed by Wilkes and others at the University of Cambridge. Lyons partially funded the development of EDSAC, and Lyons set up a project team led by John Pinkerton to develop its own computer that would be suitable for business applications. This led to the Lyons Electronic Office (LEO) I computer, which was based on EDSAC but adapted to business data processing. It was initially used for valuation jobs and later extended to other business applications. Lyons was one of the pioneers of IT outsourcing as it performed payroll calculations for several companies in the United Kingdom.


  1. Ferry G (2003) A computer called LEO: lyons tea shops and the world’s first office computer. Fourth Estate Ltd, LondonGoogle Scholar

Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  • Gerard O’Regan
    • 1
  1. 1.SQC ConsultingMallowIreland

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