Marcus was educated in Coláiste Eoin, Stillorgan before going on to complete a degree in Business and Legal Studies in UCD and qualifying as a solicitor in 2007 with William Fry.
In 2009 he joined leading Irish PR agency Pembroke Communications to work in their Sports and Sponsorship division. His client list included the GAA, the LGFA, Dublin GAA County Board, Bord Gáis Energy U-21 Hurling Championship, AIG, Under Armour, Sports Surgery Clinic, Setanta Sports, TG4 and the FBD 7s. He also completed a Diploma in PR and Event Management in the Dublin Business School in 2012.
Marcus has worked with a number of print titles and broadcast media over the years including Setanta Sports, Foinse, Raidió na Life, Raidió na Gaeltachta, Newstalk, Irish Daily Star and he still commentates with TG4 and TV3 on Gaelic games. He has also contributed extensively on the business of sport and sponsorship in Ireland with the likes of RTÉ’s Drive Time and 2FM’s Tubridy.