It is believed that Joseph has never been married in his life but there is information about his romantic love life in the media. He was once in a relationship with Alison but this relationship was short-lived. Later on, he began dating Arabella Ajar. They are still in love. His nationality is American.
At his young age, Joseph was enrolled at Catholic school Our Lady of Lourdes. In 2001, he joined University of Southern California's School of Cinematic Arts. He joined this school under the recommendation of director Steven Spielberg. He has been active as an actor since 1990. He made his acting debut that year by portraying the role of Jason Harrison in the TV film Unspeakable Acts. That year he also played the role of Wendell McGaffney in the movie Presumed Innocent.
Two years later, in 1992, he portrayed the role of Bobby in a drama-fantasy film Radio Flyer. For this role, he got his first nomination in Young Artist Awards in 1993. He is also well acclaimed for portraying his role in the movies like Desperate Choices: To Save My Child, Jurassic Park, and The Cure. In 2007, he appeared in a short movie Matters of Life and Death. He also made his directorial debut in 2007 by directing this short movie.
His net worth is $1.5 million.