Alpha Delta Sigma (ADS), a national honor society sponsored by the American Advertising Federation, recognizes and encourages scholastic achievement in advertising studies. ADS is the only national, professional advertising honorary society in American higher education. Each year, hundreds of students from the AAF's college chapters are nominated and inducted into Alpha Delta Sigma. The organization dates back to 1913, when the fraternity was founded at the University of Missouri. In 1969, ADS merged with Gamma Alpha Chi, a similar organization for women. Later, in 1973, ADS merged with the American Advertising Federation.