Theo Breuer was born in Bürvenich, North Rhine-Westphalia, West Germany and educated at Cologne University where he studied German and English linguistics and literature.

[2] Breuer has participated in numerous mail art projects since 1991 together with artists such as Ryosuke Cohen, Guillermo Deisler, David Dellafiora or György Galántai.

Theo Breuer's poems have been translated into Arabic, English, French, Georgian, Italian, Polish, Romanian and Russian and published in numerous national and international anthologies, calendars, catalogues, literary magazines, and the Internet.

As editor of an annual anthology of handwritten poetry he has collected original autographs by well-known poets such as Hans Bender, Richard Berengarten, Günter Kunert, Walter Helmut Fritz, Michael Hamburger and many more.

[10] As permanent freelancer of the German annual Muschelhaufen (edited by Erik Martin) from 1994–2008 Breuer contributed essays and reviews on mail art, contemporary poetry and prose as well as portraits on coeval authors and small presses.