Born in Vlădești, Argeș County, he graduated high school in Câmpulung in 1967 and Bucharest's Caragiale Academy of Theatrical Arts and Cinematography in 1971. He made his theatrical debut a year before graduating, at the Bulandra Theater, in Truman Capote's The Grass Harp. His screen debut came in Dan Pița's Nunta de piatră (1972); he would later appear in the same director's Filip cel Bun (1975). Other directors with whom he has worked include Alexandru Tatos (Mere roșii, 1975; Secvențe, 1982; and Secretul armei secrete, 1988), Virgil Calotescu (Buletin de București, 1982; and Căsătorie cu repetiție, 1985), Nae Caranfil (Asfalt Tango, 1996; and Filantropica, 2002) and Cătălin Mitulescu (The Way I Spent the End of the World, 2006). In all, he has appeared in more than sixty films. Diaconu worked with Lucian Pintilie both in film (the 1981 De ce trag clopotele, Mitică?) and in theater: Gogol's The Government Inspector at Bulandra, and Shakespeare's As You Like It at the ...
The Prophet, the Gold, and the Transylvanians
1978
Philanthropy
2002
To Paris with the Identity Card
2015
The Sign of the Serpent
1981
Sequences...
1982
A Summer Tale
1976
Videograms of a Revolution
1992
Waiting for a Train
1982
Tache
2007
Poker
2010
Why Are the Bells Ringing, Mitica?
1981
Asphalt Tango
1996
Ticăloșii
2007
Love Sick
2006
Promisses
1985
Before the Silence
1978
Starting Over
1987
Oil
1977
Kino Caravan
2009
The Way I Spent the End of the World
2006
Reach for the Sky
1990
In-laws
2014
The Poseidon Explosion
1973
Operation 'The Bus'
1978
The End of the Night
1982
Horea
1984
Flames Over Treasures
1988
Poor Ioanide
1980
The House Between the Fields
1980
The Secret of the Secret Weapon
1988
Fii cu ochii pe fericire
1999
The Stone Wedding
1973
The Oil, the Baby and the Transylvanians
1981
The Actor and the Savages
1975
The Actress, the Dollars and the Transylvanians
1978
Tragic Vacation
1979
Bucharest Identity Card
1982
Together Again
1978