Garth was Finance Director of SigmaRoc from inception until April 2020, at which point he stepped down from his part-time executive role, but remained as a non-executive board member and Company Secretary. In August 2021, in conjunction with the acquisition of Nordkalk, Garth returned as a full-time executive and Chief Financial Officer.

Prior to joining SigmaRoc, Garth began his career providing audit and corporate services in Perth, qualifying at KPMG, before moving to London in 2005 where he provided compliance services across a range of industries. This led Garth to a Finance Manager role at Apple Inc. where he spent four years working on business process improvement, developing and implementing new and improved financial processes and systems before co-founding Westend Corporate LLP providing corporate and financial consulting services for AIM quoted companies, predominantly within the mining and resources industries.

Garth holds a Bachelor of Commerce Degree and is a member of the Institute of Chartered Accountants in England and Wales.