LECO Corporation, founded in 1936 by Carl Schultz and George Krasl, operates its analytical instrumentation research and development, and manufacturing from its headquarters located in St. Joseph, Michigan.

[3] LECO develops and manufactures elemental measurement and molecular Time-of-flight mass spectrometry instrumentation, following ISO 9000 standards.

[4], [5] LECO carries out research in many fields of analytical chemistry including protein measurement in foods, sulfur in coal emissions, glow discharge emission in metals, multi-dimensional gas chromatograph mass spectrometry, environmental monitoring, air quality, Metabolomics, and diverse medical and pharmaceutical applications.

As of June 8, 1977, Robert J. Warren (1933-2022), husband of Elizabeth D. Schultz and son-in-law of Carl Schultz, and family have become the sole owners of the company, acquiring outstanding stocks which had become the property of the George J. Krasl Trust following George Krasl's death on August 5, 1976.

LECO became a worldwide supplier of instruments and metallographic equipment under Warren's management, and one of southwestern Michigan's larger employers.