USIM is the fastest growing independent media agency providing best-in-class integrated media solutions. Every day and with every challenge, we Practice the Art of Human Sense – blending cutting-edge research and technology with ingenuity, human insight, and creativity, delivered in a seamless experience for our client and agency partners. by media pioneer Dennis Holt in 2004, USIM is headquartered in Los Angeles, has 15 offices throughout the United States and Canada, and was named MediaPost’s first-ever Programmatic Agency of the Year.