John Graham McWhirter (born 28 March 1949) is a British mathematician and engineer in the field of signal processing.
He graduated in mathematics from Queen's University Belfast in 1970, and did his PhD there in 1973 on "The Virial Theorem in Collision Theory" under Benjamin Moiseiwitsch.
[2] He started working in the Signal Processing Group at the Royal Signals and Radar Establishment, Great Malvern, in the late 1970s, and has worked there for RSRE's successor organisations, currently QinetiQ.
McWhirter left QinetiQ on 31 August 2007 to take up his current post as Distinguished Research Professor in Engineering at Cardiff University.
His work has mainly been in military areas including radar, sonar and communications, recently branching into civil applications.