Maxse was the daughter of Ernest George Berkeley Maxse (18 November 1863 – 13 March 1943) and Sarah Alice Nottage-Miller (died 25 May 1908). In 1940, Maxse was appointed director of the
Children's Overseas Reception Board and vice-chair of the
Women's Voluntary Service for Civil Defence (WVS). In addition, she was also chief of staff for Section D (the "D" stood for destruction) of
MI6.
Guy Burgess, the Soviet spy, worked for Section D and suggested to Maxse she should recruit his friend,
Kim Philby. In his book
My Secret War (1968) Philby described his first meeting with Maxse: "I found myself in the forecourt of
St. Ermin's Hotel, near St James's Park station, talking to Miss Marjorie Maxse. She was an intensely likeable elderly lady (then almost as old as I am now). I had no idea then, as I have no idea now, what her precise position in government was. But she spoke with authority, and was evidently in a position at least to recommend me for interesting employment. At an early stage of our talk, she turned the subject to the possibilities of political work against the Germans in Europe." ==Honours==