Prior to joining Promontory, he served as a financial controller at a specialist construction firm, where he oversaw accounts receivable, accounts payable, invoicing, payroll, and all treasury operations and developed and implemented firmwide policies and procedures. Killian previously worked for AXA Insurance Ireland, where he was a business and research analyst and undertook an in-depth statistical analysis of a large database to create a model aimed at optimizing return on promotional investment based on consumer characteristics and demographics.