The company was founded in 1947, by Wendell Milliman and Stuart A. Robertson and operates 59 offices internationally, with over 3,000 employees.

[citation needed] Milliman is owned and managed by approximately 350 principals.

In the late 1940s, actuary Wendell Milliman started a consultancy in the Pacific Northwest.

The firm was initially centered mainly on assessing business risk and pension issues.

[1][2] During the 1950s, Milliman & Robertson established the first health insurance benchmarking tool for the US healthcare market.