Quick Answer: Milliman, formerly Milliman & Robertson, is an international actuarial and consulting firm based in Seattle, Washington. The company was founded in 1947, by Wendell Milliman and Stuart A. Robertson and operates 59 offices internationally, with over 3,000 employees. Milliman is owned and managed by approximately 350 principals. The firm's primary business includes consulting practices in employee benefits, healthcare, investment, life insurance and financial services, and property and casualty insurance. The firm also provides data analysis and predictive analytics.