The conservation organisation protects and promotes Scotland's natural and cultural heritage, welcoming millions of visitors per year and overseeing 11,000 archaeological sites, 129 heritage properties, and 76,000 hectares of Scottish countryside.
Sir Mark, who was Master of the College from 2011-2016, was previously the Director of the National Museums of Scotland from 1992-2001, and Director of the V&A from 2001 until he took up Mastership of the College. He is currently Chair of the Pilgrim Trust and the Historic Scotland Foundation.
Of the appointment, Sir Mark said: ‘It has never been more important to understand our history and heritage and to protect our natural environment. I am delighted to be working with the National Trust for Scotland which does all of this so well.’