Pallenberg was born in England in 1939. His father was Corrado Pallenberg (1912–1989), an Italian physician and journalist who worked as a papal medical adviser. He moved to New York City in the 1960s to study architecture, where he met director John Boorman.[3][4]
Pallenberg's first credited screenplay was for Boorman's Arthurian fantasy epic Excalibur (1981), which earned him and the director a Hugo Award nomination for Best Dramatic Presentation. He then wrote his 1985 film The Emerald Forest.[2] They had a falling out over Boorman's insistence on casting his own son Charley in the lead role, though they reconciled years later, co-writing scripts about Hadrian and Cú Chulainn.[6]
The Lord of the Rings (early-to-mid-1970s) - Adaptation of J. R. R. Tolkiennovel, for producers Gabriel Katzka, David Picker, and Arnold Picker. Co-written with and intended to be directed by John Boorman.