Severus Snape is a fictional character in J. K. Rowling's Harry Potter series. He is an exceptionally skilled wizard whose extremely cold and resentful exterior conceals deep emotions and anguish. A Professor at Hogwarts School of Witchcraft and Wizardry, Snape is hostile to Harry due to his resemblance to his father James Potter, who bullied Snape during their time together at Hogwarts. As the series progresses, Snape's character becomes more layered and enigmatic. A central mystery is unravelled concerning his loyalties. Snape dies at the hands of Lord Voldemort in the seventh book, at which time his back story is revealed. Despite his attraction to the Dark Arts and Voldemort's ideology of wizard supremacy, Snape's love for Muggle-born Lily Evans, Harry's mother, eventually compelled him to defect from the Death Eaters. He then became a double agent for Albus Dumbledore and the Order of the Phoenix. The fact that Lily chose James Potter, Harry's father, only fuels Snape's hostility towards Harry. Snape's character has been widely acclaimed by readers and critics. Rowling described him as "a gift of a character" whose story she had known since the first book. Elizabeth Hand of The Washington Post explained that Snape's life "is the most heartbreaking, surprising and satisfying of all of Rowling's achievements". Actor Alan Rickman portrayed Snape in all eight Harry Potter films, released between 2001 and 2011. Source: Wikipedia (en)