Michael Walker (mathematician)

Michael Walker OBE (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.^[1][2][3][4]

Michael Walker
Born	(1947-01-14)14 January 1947
Died	27 September 2018(2018-09-27) (aged 71)
Nationality	British
Alma mater	Royal Holloway, University of London
Scientific career
Fields	Mathematics
Institutions	King's College London University of Tübingen