Isaac Asimov (1920–1992), biochemist and science fiction writer.[42] William Bains, Cambridge biologist, a contributor to the journal Astrobiology.[75] John Baross, oceanographer and astrobiologist, who chaired a committee of scientists under the United States National Research Council that published a report on life's limiting conditions in 2007.[76] The report addresses the concern that a space agency might conduct a well-resourced search for life on other worlds "and then fail to recognize it if it is encountered".[77] Gerald Feinberg (1933–1992), physicist and Robert Shapiro (1935–2011), chemist, co-authors of the book Life Beyond Earth.[78][79] V.Axel Firsoff (1910–1981), British astronomer.[80] Robert A. Freitas Jr. (1952–present), specialist in nano-technology and nano-medicine; author of the book Xenology.[81][82] J. B. S. Haldane (1892–1964), a geneticist noted for his work on abiogenesis.[43] George Pimentel (1922–1989), American chemist, University of California, Berkeley.[83] Carl Sagan (1934–1996), astronomer,[83] science popularizer, and SETI proponent. Peter Sneath (1923–2011), microbiologist, author of the book Planets and Life.[56]