Where can I find information on a specific sword smith?
There are numerous reference books that give details (when known) of specific sword smiths. Hawley’s Japanese Swordsmiths, Revised is possibly the most used English language source for dates and locations. The Nihonto Koza series, translated by Harry Watson, is an invaluable resource with detailed information of numerous schools of sword smiths and specific smiths. There are also several indexes on this site for Showa era sword smiths who made swords in the traditional manner (gendaito indexes). Most of the best material is available only in Japanese. You can also post a message to one of the online message boards requesting information.