Alexander MacLean Sinclair was born in Glen Bard, Antigonish County. He became a Presbyterian minister, author, educator and Gaelic scholar. While he served as a minister in the community of Belfast, Prince Edward Island (1888–1906), he self-published several books on indigenous Gaelic culture in Nova Scotia filled with song, lore and culture. He later retired back to Nova Scotia, where he lectured on Gaelic language and culture at St. Francis Xavier and Dalhousie universities. One of his students, Angus L. Macdonald, later became premier of Nova Scotia.