Alexander Joseph Patrick Wilson was an English writer, spy and MI6 officer. He wrote under the names Alexander Wilson, Geoffrey Spencer, Gregory Wilson and Michael Chesney. He was an undiscovered bigamist, and lied to many people who only discovered some of his secrets after he died. As of 2018, the truth of some of his life is documented in files classified as "sensitive" by the Foreign and Commonwealth Office, under section 3(4) of the Public Records Act 1958. His family's story was dramatised in the 2018 BBC miniseries Mrs Wilson, in which his granddaughter, actress Ruth Wilson, portrayed his third wife.