FRS, MD (17 November 1923 – September 9, 2011) was a microbiologist who co-founded the field of numerical taxonomy, together with Robert R. Sokal. Sneath and Sokal wrote Principles of Numerical Taxonomy,[1] revised in 1973 as Numerical taxonomy.[2] Sneath reviewed the state of numerical taxonomy in 1995[3] and wrote some autobiographical notes in 2010.[4]