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Nature Cell Biology 3, E98 (1 April 2001) | doi:10.1038/35070167

Obituary Arnold Greenberg

Pierre Golstein

Arnold Greenberg died on 11 February 2001, aged 59, of cancer. Should I emphasize his scientific achievements? These consistently revolved around cell-mediated cytotoxicity and cell death, notably his 1973 discovery, while working as a PhD student in Ivan Roitt's laboratory, of cytotoxic `null' lymphoid cells (later known as NK cells and described independently at about the same time in Stockholm and at the NIH).