Friedrich Dürrenmatt (1921-1990) was a celebrated Swiss author of many plays and novels, with Der Besuch der alten Dame (The Visit) first performed in 1956.
It came to prominence in the English-speaking world in its original English version by acclaimed playwright, author and critic Maurice Valency (1903-1996).
Tony Kushner is a Pulitzer Prize-winning American playwright, author and screenwriter, whose work includes Angels in America and the screenplays for Munich, Lincoln, and a new version of West Side Story, amongst many others.