Kronos Incorporated is a U.S.-based multi-national workforce management software and services company headquartered in Chelmsford, Massachusetts, United States, and employing 3,200 people. Delivered its first PC-based time and attendance product in 1985. 2  Under Mark Ain's leadership, Kronos sustained one of the longest records of growth and profitability as a public company in software industry history — second only to Microsoft.