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TeamGantt was co-founded by John Correlli and Nathan Gilmore in 2009. At the time, they were developing software for large roofing contractors in Baltimore, Maryland. After trying to find good ways to schedule and collaborate on projects online, they can't find anything that works well. They decided to meet the challenges of the construction, and finally established the TeamGantt. They quickly realized that other companies might be interested in the product. Once the early versions are ready, they can let others try them out. It quickly became popular because so many people were looking for the same thing! After repeated user feedback and close attention to usability, the company launched in November 2010. Within hours, they had a handful of customers, and in their first year, they attracted celebrities like Twitter, Expedia and Turner.