Mark Ivor Satin is an American political theorist, writer, and newsletter publisher. He is best known for contributing to the development and dissemination of three political perspectives – neopacifism in the 1960s, New Age politics in the 1970s and 1980s, and radical centrism in the 1990s and 2000s. Satin's work is sometimes seen as building toward a new political ideology, and then it is often labeled "transformational", "post-liberal", or "post-Marxist". One historian calls Satin's writing "post-hip".

New Age is a range of spiritual or religious practices and beliefs which rapidly grew in Western society during the early 1970s. Its highly eclectic and unsystematic structure makes a precise definition difficult. Although many scholars consider it a religious movement, its adherents typically see it as spiritual or as unifying Mind-Body-Spirit, and rarely use the term New Age themselves. Scholars often call it the New Age movement, although others contest this term and suggest it is better seen as a milieu or zeitgeist.