Samuel was born in the West Indies the younger son of soldier John Davis, whose appointment as Commissary general there had been signed by King George II in 1759 and countersigned by William Pitt.
[1][2] In 1783, Warren Hastings, the Governor of the Presidency of Fort William (Bengal) assigned Davis "Draftsman and Surveyor" on Samuel Turner's forthcoming mission to Bhutan and Tibet.
[3][4] Unfortunately, the Tibetans (or more probably the Chinese ambans, the de facto authority in Tibet) viewed his "scientific" profession with suspicion and he was forced to remain in Bhutan until Turner and the others returned.
[7] The incident was the subject of a book by his son, John F. Davis, entitled Vizier Ali Khan or The Massacre of Benares, A Chapter in British Indian History published in london in 1871.
He was elected a director of the EIC in October at the instigation of President of the Board of Control, Henry Dundas and to the latter's disgust, acted independently thereafter until his death in 1819.
"At the time of the renewal of the [company's] Charter in 1814, the Committee of the House of Commons entrusted him [Davis] with the task of drawing up, in their name, the memorable "Fifth Report on the Revenues of Bengal", which remains a monument of his intimate acquaintance with the internal administration of India"[8]While in Burdwan, Davis married Henrietta Boileau, who was from a refugee French noble family[7] who had come to England in the early eighteenth century from Languedoc in the South of France.