Siri a former Captain in the British Army served with the Brigade of Gurkhas for 26 years he joined at a young age from Nepal after passing the highly competitive selection process in which only 1 in 25,000 are selected. Siri progressed through the ranks quickly reaching the rank of Captain well ahead of his peers serving on a number of operational tours including Afghanistan. After leaving the army Siri was selected to fill a critical role with FSI UK's joint venture providing training support to the MOD, Siri held the role of project and resource manager on the £25m contract for over 5 years and was commended for his leadership and management.

Siri then joined FSI as Operations Manager in 2013 and was involved in a number of projects and possessions before taking up the role of Head of Operations for Infrastructure where he has designed, managed and delivered all FSI's security solutions within the rail and high net worth sectors.