Jack Weinberg coined the phrase “Don’t trust anyone over 30” during the Free Speech Movement in the mid 1960's, which has been described as a "struggle by students over the right to engage in political speech on campus, which helped to catalyze broader political activism on campuses around the country over student rights, civil rights and the Vietnam War."
Free Speech Movement
The Free Speech Movement took place at UC Berkeley from Sept. 10, 1964, through Jan. 4, 1965.  It was a "student protest...under the informal leadership of students Mario Savio, Jack Weinberg, Michael Rossman, Brian Turner, Bettina Aptheker, Steve Weissman, Art Goldberg, Jackie Goldberg..."
Later YearsEnvironmental Health Fund on international toxic pollution issues, and "has remained an activist since his student days...He worked for Greenpeace, the international environmental organization, for the past 10 years. In January he left to join the Environmental Health Fund, a Boston-based organization that works with public interest groups to protect public health from injury caused by chemical pollution and other forms of environmental disruption.
Weinberg works with organizations around the world – especially in developing countries – to build a global, activist network that challenges many of the policies and practices of the international chemical industry.
Following his student days, Weinberg was a union activist for many years. In 1982, an organization of unionists, community members and environmentalist led by Weinberg successfully defeated a nuclear power plant proposed in Indiana on Lake Michigan."