Andrew Lech (1905 – 1991) was a postal worker in Chicago, Illinois. He lived in the suburb of Aurora. He retired from the post office in approximately 1940. He began making scale models on a part-time basis while in high school. He began work on the Spirit of St. Louis model in 1931. It was completed in 1933. It had a wingspan of 36 inches and featured working systems, including fully functioning control systems. In 1940 he was commissioned by the... Smithsonian Institution to provide structural and external view drawings of the Spirit of St. Louis. He also constructed fifty precise scale models of various 1900 to 1930s aircraft. In addition, he was commissioned by a patron in Orange County in 1967 to build scale models of experimental aircraft as well as models that were proposed, but never executed. This commission also included dioramas of WWI airdromes.

In 1939 Mr. Lech began a correspondence with Paul Garber, Assistant Curator for aeronautics with the Smithsonian Institution. This culminated in the donation of the model to the Smithsonian in 1972.