The New York-based firm has extended the duration of its public interest fellowships from three months to one year, with the expectation that the associates will return to the firm after their service.

Simpson Thacher partner William T. Russell said that the move was not a result of a decrease in work for the associates, but he also said that it “would not surprise” him if the usual associate attrition at his law firm, like others, has declined during the recession. Russell co-chairs the law firm’s pro bono committee.