Peter William Jerndorff (24 November 1842 – 23 December 1926) was a Danish stage actor and opera singer. Amongst the roles he created were Dr. Rank in Ibsen's 1879 play A Doll's House and Leonard in Carl Nielsen's 1906 opera Maskarade. Towards the end of his career he taught diction and acting and appeared in Carl Dreyer's 1922 silent film Der var engang (Once Upon a Time). His students included the Danish opera singers Lauritz Melchior and Vilhelm Herold. Jerndoff died in Copenhagen, the city of his birth, at the age of 84.
- Blangstrup Christian (ed.) (1915–1930) "Jerndorff Peter William". Salmonsens Konversationsleksikon 2nd Edition Vo]. 13, p. 32 (in Danish)
- Drum, Jean and Drum, Dale (2000). My Only Great Passion: The Life and Films of Carl Th. Dreyer, pp. 99–102. Rowman & Littlefield. ISBN 0810836793
- Emmons, Shirlee (1990). Tristanissimo: The Authorized Biography of Heroic Tenor Lauritz Melchior, p. 336. Schirmer Books. ISBN 0028730607
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