The history of DISC has evolved over centuries, beginning with the Greek philosopher Empedocles, who proposed that the four elements of fire, earth, air, and water influenced people's behavior. By 400 BC, Hippocrates had redefined these four elements as the four temperaments, which included Choleric, Sanguine, Phlegmatic, and Melancholic. These temperaments would eventually form the basis of modern-day personality theory.

William Moulton Marston, a psychologist and inventor, was the next person to build on this theory. In 1928, Marston published "Emotions of Normal People," which introduced his DISC Personality System. Marston believed that people's behavior was influenced by four behavioral traits, which he named Dominance, Influence, Steadiness, and Compliance.

Marston's DISC theory was further developed in the 1940s by Walter Clarke, who created the first DISC assessment. Since then, DISC has been widely used in various settings, including personal development, team building, and career counseling.

Today, many companies offer DISC assessments and training programs, and PeopleKeys is one of the leading publishers internationally. PeopleKeys has been providing DISC-based solutions for over 35 years, helping individuals, teams, and organizations understand and utilize their unique strengths and preferences. Through their assessments and training programs, PeopleKeys aims to improve communication, teamwork, and overall performance in a variety of settings.

The history of DISC spans centuries and has been built upon by numerous psychologists and theorists. Today, DISC remains a widely used tool for personal and professional development, and PeopleKeys is one of the companies that provides DISC-based solutions to individuals, teams, and organizations.