Alex Montgomery was born into a family with French, Scottish, Anglo-Irish and Spanish ancestry. Originally destined for the Diplomatic Service, Montgomery chose instead to go to sea, leading a nomadic life in numerous parts of the world. He arrived in Melbourne in 1870 and worked there as a journalist before setting out for Singapore and the Malay Archipelago, returning to Sydney via Java in 1884.
Montgomery was on the staff of the Evening News for some time, worked in the bush as a surveyor and subsequently took up a position with the Sydney Echo. After its demise he became a regular contributor to the Bulletin, and finally a member of its staff, editing the 'Aboriginalities' section. In 1896, Montgomery became the editor of the Sydney journal Cosmos.
Writing under pseudonyms, Montgomery also wrote serials for the Australasian and other papers.