He was Local Assistant Keeper of Rona Lighthouse and the part-time postman for the north end of Raasay.
With the outbreak of World War I, Calum and his mother moved to the croft and house adjacent to that of his grandfather, in northern Raasay.
[1] Calum attended Torran school, with its single teacher, James Mackinnon (Seumas Ruadh).
Purchasing Thomas Aitken's manual Road Making & Maintenance: A Practical Treatise for Engineers, Surveyors and Others (London, 1900), for half a crown, he started work, replacing the old narrow footpath.
Over a period of about ten years (1964–1974), he constructed 1+3⁄4 miles (2.8 kilometres) of road between Brochel Castle and Arnish, using little more than a shovel, a pick and a wheelbarrow.
[1] Calum's Road has been commemorated in music by Capercaillie on their 1988 album The Blood is Strong and in a book by Roger Hutchinson.
A song on Scottish band Runrig's eleventh studio album The Stamping Ground, entitled "Wall of China/One Man" was inspired by Calum's story.
Some, but by no means all, of his writings were published during his lifetime as articles in the Gaelic periodical Gairm, while others have been posthumously collected, translated, and edited by his daughter Julia Macleod Allan as Fàsachadh An-Iochdmhor Ratharsair: The Cruel Clearance of Raasay (Clò Àrnais, 2007).
[biographical anecdotes concerning Captain Donald McRae (1893–1963), Sydney Harbourmaster 1951-6] 'Màiri Mhòr nan Òran agus an ceannaiche', Gairm, 114 (Spring, 1981), 122–3.
Julia Macleod Allan), Fàsachadh An-Iochdmhor Ratharsair: The Cruel Clearance of Raasay (Clò Àrnais, 2007).