Michael Walker (14 January 1947 – 27 September 2018) was an English mathematician who was instrumental in developing the standards that apply to mobile telecommunications and particularly in respect of the SIM card.

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1947 births 2018 deaths Members of the Order of the British Empire Vodafone people Academic staff of the University of Tübingen Scientists from Winchester Deaths from bronchopneumonia Deaths from cancer in England Academics of King's College London Alumni of Royal Holloway, University of London English mathematicians Place of birth missing Place of death missing {{UK-mathematician-stub