THEN & NOW: The cast of 'Harry Potter' 15 years later

When the first movie in the "Harry Potter" series was released in 2001, Daniel Radcliffe was an 11-year-old kid with only a few acting credits to his name.

Needless to say, a lot has changed since then. Radcliffe went on to gain international fame, playing roles on stage and screen. But he's not the only one. Many of his Hogwarts' classmates and professors have starred in some of our favorite films and television shows, from "Star Wars: The Force Awakens" to "Fear the Walking Dead."

Keep reading to see what 21 of your favorite witches and wizards have been up to since "Harry Potter."

THEN: Daniel Radcliffe starred as bespectacled and famed wizard Harry Potter.

NOW: Radcliffe's career has spanned both stage and screen. He had roles in "Kill Your Darlings" and "Trainwreck" and starred in "How to Succeed In Business Without Really Trying" on Broadway in 2011. This year, Radcliffe was honored with his own star on the Hollywood Walk of Fame.

THEN: Rupert Grint played Harry's redheaded best friend, Ron Weasley.