Conversation so far:
Who did Jane Jacobs write for?
Jane Jacobs became a feature writer for the Office of War Information, and then a reporter for Amerika, a publication of the U.S. State Department.
What happened after the Harvard lecture for Jane Jacobs?
After reading her Harvard speech, William H. Whyte invited Jane Jacobs to write an article for Fortune magazine.
What is the Harvard lecture for Jane Jacobs?
Jane Jacobs delivered a leacture addressing leading architects, urban planners, and intellectuals, speaking on the topic of East Harlem.
Who did Jane Jacobs meet after delivering a lecture addressing leading architects at Harvard?
Jane Jacobs' Fortune article brought Jacobs to the attention of Chadbourne Gilpatric, associate director of Humanities at the Rockefeller Foundation. Gilpatric invited Jacobs to become a reviewer for grant proposals.
What is special about Chadbourne Gilpatric to Jane Jacobs?
From the mid-1950s to the mid-1960s, the foundation's Humanities Division sponsored an Urban Design Studies research program, of which Jane Jacobs was the best known grantee.
What happened to Jane Jacobs and Chadbourne Gilpatric after the Rockefeller foundation's Humanities Division sponsored an Urban Design Studies research program?
Chadbourne Gilpatric encouraged Jane Jacobs to explor[e] the field of urban design. Affiliating with The New School, she spent three years conducting research and writing. Random House published the result.
What year was Jane Jacobs' book published after three years of conducting research and writing with The New School?
In 1961 The Death and Life of Great American Cities  by Jane Jacobs was published.
What happened to Jane Jacobs after publishing The Death and Life of Great American Cities in 1961?
In 1962, Jane Jacobs resigned her position at Architectural Forum to become a full-time author and mother.

Question: What did they do?
Self-contained rewrite: What did The Joint Committee to Stop the Lower Manhattan Expressway do?