Cecil Whiteley attended Dulwich College, where he had an undistinguished academic record, before studying at King's College, Cambridge, where he graduated BA in 1897 with a Third Class degree in the Classical Tripos. He was appointed a Treasury Counsel in 1915, in which year he appeared for the prosecution at the Old Bailey with Archibald Bodkin (later Director of Public Prosecutions) and Travers Humphreys against George Joseph Smith, the 'Brides in the Bath' murderer. In 1919 Whiteley prosecuted in the case of the Epsom Riot, when about four hundred Canadian soldiers rioted and attacked the police station at Epsom on June 17, 1919. During the riot Station-Sergeant Green was so badly injured that he died the following day.
He was appointed Recorder of Sandwich in Kent in 1920, and a King's Counsel (KC) in 1921. In the 1922 Edith Thompson and Frederick Bywaters murder case Whiteley defended Bywaters. In 1925 Whiteley served as the Chairman of the Surrey Quarter Sessions and, in 1931, of the London Quarter Sessions. He was the Deputy Lieutenant of the County of Surrey in 1925. He became of Recorder of West Ham in 1929, and of Southend-on-Sea in 1930.
Whiteley was a Judge at the Mayor's and City of London Court from 1932 to 1934; in the latter year he succeeded Henry Holman Gregory KC as Common Serjeant of London, an ancient office first recorded in 1291 with the appointment of Thomas Juvenal, and the second most senior judicial position at the Old Bailey after the Recorder of London. In 1939 he became a Governor of Dulwich College.
- Cecil Whiteley, K.C., D.L 'Brief Life' Macmillan & Co., Ltd, London (1942)
- "Whiteley, George Cecil (WHTY894GC)". A Cambridge Alumni Database. University of Cambridge.
- Wilson, Colin; Patricia Pitman (1984). Encyclopedia of Murder. London: Pan Books. pp. 577–580. ISBN 0-330-28300-6.
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- Whiteley, Cecil 'Brief Life' Pub. MacMillan & Co. Ltd (1942) pg 213
- London Gazette December 13, 1935
- London Gazette December 17, 1937
- The Lady Killers The Season 2, Episode 5: The Darlingest Boy 7 August 1981 Internet Movie Database