Dario Fo (born 24 March 1926) was a Italian play write who wrote the devil in drag  much of his dramatic work depends on improvisation and comprises the recovery of "illegitimate" forms of theatre.
In 1950, Fo asked to work with Franco Parenti on a variety show performed by radio actors, beginning a collaboration that would last until 1954. Fo delighted audiences with stories of his upbringing that Parenti was very impressed by, describing them as "absolutely original, with an extraordinary humour, wit and personification. When the show was over we'd go for walks round the lake and he'd tell me more stories. In this way we originated a project in which we would work together on a new type of revue, one which didn't copy reality, but which involved people and took a stand.(source from wikipedia)