Tracy Horner (defendant) worked for Lucht’s Concrete Pumping, Inc. (Lucht’s) (plaintiff) as a division manager who was responsible for establishing and maintaining business relationships in the region. Lucht’s was a corporation in the concrete-pumping business. Horner had been hired as an at-will employee in 2001. In 2003, Horner was asked to sign a non-compete agreement that prohibited Horner from soliciting customers or employees of Lucht’s for 12 months after leaving employment with Lucht’s. Horner signed the non-compete agreement. The following year, Horner resigned and began working for Everist Materials, LLC (Everist), a competitor of Lucht’s. Everist had recently entered the concrete-pumping business and hired Horner to be its manager. Everist and Lucht’s shared many customers in the region, and Lucht’s sued Horner for breaching the non-compete agreement. Horner moved for summary judgment, alleging that the non-compete agreement was unenforceable due to lack of consideration. The trial court granted the summary-judgment motion. Lucht’s appealed to the court of appeals, which affirmed. Lucht’s then appealed to the Colorado Supreme Court.