who was the screen writer in erin brockovich

"Erin Brockovich" is a film that was released in the year 2000. The screenplay for the movie was written by Susannah Grant. The film is based on the true story of Erin Brockovich, portrayed by Julia Roberts, who played a significant role in building a case against the Pacific Gas and Electric Company (PG&E) of California in 1993. Roberts won an Academy Award for Best Actress for her performance in the film.