Calum owns the Loch Melfort Hotel and a consultancy business Red Roof Business Support with his wife Rachel. Appointed to the board of Highlands & Islands Enterprise in September 2019, and to the Court of the University of the Highlands & Islands in January 2022. In November 2022 he was appointed to the new Tourism & Hospitality Industry Leadership Group. He was a board member of VisitScotland from 2013 until 2019.

He is a director of UK Hospitality, Scottish Tourism Alliance, Highlands & Islands Tourism Awards and Argyll & the Isles Tourism Co-operative.

Calum was employed in food & beverage supply to the industry for 23 years prior to acquiring the hotel, culminating in roles as UK Managing Director and then Chief Operating Officer, Latin America for Unilever Foodsolutions.