In September 1991, William joined Sheepscombe Primary School. He studied there for about seven years. And then he joined Wycliffe College. He also repeated his 6th grade at Downfield Sixth Form, Stroud because of his involvement in filming. In 1998, he was just aged 11 years old and during that year he appeared as an extra in the Cider with Rosie (TV). Half a decade later, he appeared in the TV movie Goodbye, Mr. Chips playing the role of Forrester. In 2005, he starred the lead role of Peter Pevensie in a high fantasy film The Chronicles of Narnia: The Lion, the Witch and the Wardrobe.
He was critically acclaimed and praised for this role. His popularity rose to prominence after he portrayed his role in the movies like The Chronicles of Narnia: Prince Caspian, The Chronicles of Narnia: The Voyage of the Dawn Treader, The Silent Mountain and so on. He has also appeared in several other movies and TV shows. His nationality is English and is of white ethnicity. His net worth is $6 million dollars.