According to the bio on Wikipedia: "George Orson Welles was an American actor, director, writer and producer who is remembered for his innovative work in radio, theatre and film. He is considered one of the greatest filmmakers of all time.
While in his twenties Welles directed a number of high-profile stage productions for the Federal Theatre Project, including an adaptation of Macbeth with an entirely African American cast and the political musical The Cradle Will Rock. In 1937 he and John Houseman founded the Mercury Theatre, an independent repertory theatre company that presented a series of productions on Broadway through 1941, including Caesar (1937), a Broadway adaptation of William Shakespeare's Julius Caesar.
In 1938, his radio anthology series The Mercury Theatre on the Air gave Welles the platform to find international fame as the director and narrator of a radio adaptation of H. G. Wells's novel The War of the Worlds, which caused widespread panic because many listeners thought that an invasion by extraterrestrial beings was actually occurring. Although some contemporary sources say these reports of panic were mostly false and overstated, they rocketed Welles to notoriety.
His first film was Citizen Kane (1941), which is consistently ranked as the greatest film ever made, and which he co-wrote, produced, directed and starred in as Charles Foster Kane."