Marcus, a Jersey advocate, has over twenty years' legal experience. Marcus qualified at Crills Advocates (now Walkers), having previously worked at Ogier. Marcus founded the Jersey office of Ozannes in June 2006, which merged with Mourant in June 2010. In November 2011, Marcus established the Jersey legal practice of Hatstone Lawyers. In December 2015, Marcus set up Lexstone Lawyers with a team from Hatstone Lawyers including Lucy Egerton-Vernon. Publications and artcles include: Jersey chapter of 'Getting the Deal Through - Private Banking & Wealth Management 2017', (2016), 'Jersey's future depends on its adaptability' (2014), Jersey chapter of 'The International Insolvency European Lawyer Reference 2012' (2012), Jersey chapter of 'The International Comparative Legal Guide to Corporate Recovery and Insolvency 2011' (2011); Jersey chapter of 'Multinational Enterprise Liability in Insolvency Proceedings' (2010); Channel Islands chapter of 'Real Estate Finance - Law, Regulation & Practice' (2008); and Jersey chapter of 'International Insurance Regulation' (2002).