His company, Evertype, supports minority-language communities, especially in the fields of character standardization and internationalization.
He is one of the co-authors of the Unicode Standard, and is a Contributing Editor and Irish National Representative to ISO/IEC JTC1/SC2/WG2, the committee responsible for the development and maintenance of the Universal Character Set.
He is a font designer and expert in the world’s writing systems, who has contributed to the encoding in the UCS of a large number of scripts ( Avestan, Balinese, Bamum, Braille, Buginese, Buhid, Unified Canadian Aboriginal Syllabics, Carian, Cherokee, Coptic, Cuneiform, Cypriot, Deseret, Egyptian hieroglyphs, Ethiopic, Georgian, Glagolitic, Gothic, Hanunó'o, Kayah Li, Khmer, Lepcha, Limbu, Linear B, Lycian, Lydian, Meitei Mayek, Mongolian, Myanmar, New Tai Lue, N'Ko, Ogham, Ol Chiki, Old Italic, Old Persian, Osmanya, Phaistos Disc, Phoenician, Rejang, Runic, Saurashtra, Shavian, Sinhala, Sundanese, Tagalog, Tagbanwa, Tai Le, Thaana, Tibetan, Ugaritic, Vai, and Yi). He is working on proposals to encode a number of ancient and lesser-known scripts (Blissymbolics, Brahmi, Cirth, Indus Valley, Linear A, Luvian, Mayan Hieroglyphics, Newari, Old Hungarian, Old Permic, Ranjana, Rongorongo, and Tengwar).
In the early 1990s, he was involved in the localization of the Apple Macintosh Operating System and other software into Irish Gaelic, Welsh, and Inuktitut.