From the NY Times, Sunday Feb. 13, 2005:

Article Highlights:
"He came to reject what he called "landscapes of affluence," and in 1961 founded the Neighborhood Renewal Corps, based in Philadelphia, which assisted members of disadvantaged communities in reclaiming, designing and rebuilding blighted urban spaces. Similar programs followed in Washington, Chicago, Boston and other cities. Mr. Linn was also a co-founder, in 1989, of the Urban Habitat Program, a project of the Earth Island Institute."

...Mr. Linn was also a founder of Architects/Designers/Planners for Social Responsibility. Until his retirement in 1986, he was a faculty member of the New Jersey Institute of Technology;...