Among the topics he has written on are: Ásatrú, Satanism, Fascism, Black metal, Charles Manson, and National Socialism. Moynihan is involved in a long standing collaborative and romantic relationship with Annabel Lee, with whom he has fathered a child.

Moynihan was born in Boston, Massachusetts to a lawyer father. He identifies his background as entirely Northern European: Irish, English, Welsh, and German. At age 15, Moynihan began making experimental industrial music, some of it power electronics, under the name Coup de Grace. It was the name for a multimedia project under which he operated from 1984-early 1989. In addition to cassettes and live performance, booklets of images and texts were released, the last of which was Friedrich Nietzsche's Der Antichrist.

In 1989, he formed the musical entity Blood Axis, for which he does the vocals and writes the music. Moynihan was an associate of the experimental musician Boyd Rice, at one point sharing an apartment with him in Denver. Beginning correspondence with him in 1988, Rice invited him to go to Japan and collaborate with him on some NON performances there in 1989. Moynihan performed in concert with Tony Wakeford, Douglas P., and Rose McDowell (the Osaka, Japan show was captured on the Live in Osaka DVD). An album titled Music, Martinis, and Misanthropy grew out of this collaboration. He moved to Denver in 1990. He was a part of the Abraxas Foundation, appearing, with Rice, on the "neo-nazi satanism" night of Bob Larson's Christian radio show. During this time he was questioned by the Secret Service about a plot to assassinate then President George H. W. Bush; he was subjected to a polygraph test, no charges were filed. An incredulous Moynihan argues that it was a plain and simple case of intimidation stemming from his correspondence with Charles Manson and visits to Sandra Good.

In 1992, Moynihan published a collection of writings by pro-Manson National Socialist Revolutionary James N. Mason. Moynihan edited Mason's newsletter SIEGE (published from 1980-1986) into a book, Siege: The Collected Writings of James Mason (review), for which he wrote the introduction. In Portland, Oregon Moynihan headed Storm Productions. Moynihan co-authored Lords of Chaos: The Bloody Rise of the Satanic Metal Underground. He has edited two Julius Evola books, and a collection of writings by Karl Maria Wiligut. He has contributed to Seconds Magazine, The Scorpion (book review), Vor Tru, and Filosophem. He is one of the editors of TYR: Myth - Culture - Tradition, and the North American editor of Runa. He contributed several pieces to the anthology Apocalypse Culture II and to the Disinformation anthology The Book Of Lies. In 2005 he edited a collection of Essays by British philosopher John Michell called Confessions of a Radical Traditionalist (ISBN 0-9712044-4-6).

Moynihan has expressed admiration for Ernst Jünger, Julius Evola, and Leni Riefenstahl.

Moynihan moved from Portland to Vermont in 2000. He helms Dominion Press and is a member of the Asatru Alliance.