Constantin Flondor (b. 1936, Cernăuţi, Northern Bucovina) is a founding member of the groups 1+1+1 (1966-1969), Sigma (1969-1981), Prolog (since 1985) and visiting professor at the Beratzhausen summer schools in Germany (since 1993). He is mostly interested in studying the primary elements – the air and the earth, which led him to a series of large-scale drawings, part of a global, integrative comprehension of the world.
- Solo (selection)
- Barabas Villa, Budapest, 2007
- Catacomba Gallery, Bucharest, 1999
- Düsseldorf, 1998
- Group (selection)
- Gallerie Tajan, Paris, 2009
- Mücsarnok Art Gallery, Budapest, 1998
- Richard Demarco Gallery, Edinburgh, 1971
- George Lecca, Flondor, de la '111' + 'Sigma' la 'Prolog' [Flondor, from 111+SIGMA to "Prolog"], IDEA Design & Print, Cluj, 2005, 197 pp. 
- Mariana Cernicova, "Constantin Flondor aduce Timişoarei cea mai mare distincţie pentru arta plastică", 2004. 
- Livius Ciocârlie, "Opinii Imprudente", October 2008.