Snowball, and most of the current stemming algorithms were written by Dr Martin Porter, who also prepared the material for the Website. The Snowball to Java codegenerator, and supporting Java libraries, were contributed by Richard Boulton. Dr Andrew MacFarlane, of City University, London, gave much initial encouragement and proofreading assistance.
Richard Boulton established the original Snowball website, from which this website has evolved.
Linguistic assistance for Russian, German and Dutch has been provided by Patrick Miles (of the Patrick Miles Translation Agency, Cambridge, UK). Pat is a distinguished translator, whose English versions of Chekhov have appeared on the London stage.
Various emailers have helped improve the stemmers with their many suggestions and comments. We must especially mention Andrei Aksyonoff and Oleg Bartunov (Russian), Steve Tolkin and Wendy Reetz (English), and Fred Brault (French). Blake Madden found a number of elusive errors in the stemmer descriptions.
Anna Tordai has provided the Hungarian stemming algorithm.
Evren (Kapusuz) Cilden has provided the Turkish stemming algorithm.
Olly Betts has made a significant performance improvement to the C codegenerator.
The Snowball mailing lists are hosted for us free by James Aylett, who owns and runs the machine that hosts the tartarus website.
We received two Romanian stemming algorithms in 2006, from Erwin Glockner, Doina Gliga and Marina Stegarescu, working at Heidelberg, and from Irina Tirdea in Bucharest. After some experimentation, the Snowball Romanian stemmer has been rewritten from scratch, but the basic list of verb endings with their separation into two groups with different removal criteria is taken from Irina Tirdea's stemmer.