Stewart is a born and bred Mackay boy and he completed his senior education at St. Patrick's College Mackay. Stewart studied his Bachelor of Applied Science degree at the Central Queensland University where he majored in Mathematics and Computing.
Following two years as an application programmer with the Department of Defence in Canberra, Stewart accepted a position at the Sugar Research Institute in Mackay. Stewart spent ten years with SRI, initially as a computer scientist and then in the role of Computer Services Manager. Stewart has extensive experience in computer and network support, programming in C, VB, VB.NET and SQL.