Erinensis

Erinensis was the pseudonym used by Peter Hennis Green (1803–1870), an Irish medical doctor who edited medical journals and wrote many columns for The Lancet from the 1820s to the 1840s.

Life Green was born about 1803 in County Cork, Ireland, the son of a farmer. He entered Trinity College, Dublin in 1820. He graduated M.D. in 1827. He specialized in childhood diseases.

From about 1824 to 1836, under the pseudonym Erinensis, he was the Dublin correspondent of the Lancet. As such, he was "the author of a brilliant series of sketches and letters" on the Irish medical scene. He had a sharp eye for the pompous or ridiculous and was encouraged by Thomas Wakley, who had founded the journal in 1823.

James Fernandez Clarke, a medical journalist who worked on the Lancet in its early days, suggested in his autobiography that Erinensis was responsible for the power the Lancet wielded in the 1820s and 1830s. At the end of the 1830s Green spent some time studying childhood diseases in Paris, after which he published articles on them in the Lancet, under his own name.