He earned a MLitt in Scottish and Irish Studies from that university in 2010[1] and he wrote his thesis about homosexuality and homoeroticism in the poetry of Crìsdean MacIlleBhàin and Cathal Ó Searcaigh.

His fourth and most ambitious collection to date was the multilingual 'Polaris', with Leamington Books, published in 2022, which included works in Gaelic, self-translated into English, Irish and Polari and including translations by Ifor ap Glyn, Stuart A. Paterson, Sam O Fearraigh, Scott De Buitléir, Taran Spalding-Jenkin, Richard Huddleson and others.

[1] He has had articles published in The Scotsman, The Scottish Express, Am Pàipear and is a regular contributor to Bella Caledonia, who named him one of their top alternative media personalities in 2018.

In 2021 he sang 'Òran an t-Saighdear' and 'Cead Deireannach nam Beann' in memory of fellow Edinburgh-based Gaelic Poet, the late Duncan Bàn MacIntyre.

His poetry has been sung by Mary Ann Kennedy, Ainsley Hammill, Malina MacDonald, Rachel Walker and Gillie MacKenzie, among others.

Marcas frequently writes songs in partnership with women musicians, notably Mary Ann Kennedy; together, they have composed the following pieces: 'Ainneamhag' for the Inverness Gaelic Choir, which won second place in the Lovat and Tullibardine Awards of 2016; 'Grioglachan', in memory of the late Maggie 'Hearach' MacDonald of Cliar.

Marcas has also written songs and composed music alongside Marit Falt, Josie Duncan, Una MacGlone, Adam Holmes, and Padruig Moireasdan.

His debut album, Speactram, including self-penned songs and others penned with Nick Turner, Adam Holmes, Gillie Mackenzie, Pàdruig Morrison and Rachel Walker was released by Watercolour Music in July, 2022.