Here's a breakdown:
* Chris Columbus directed the first two films: Harry Potter and the Sorcerer's Stone (2001) and Harry Potter and the Chamber of Secrets (2002).
* Alfonso Cuarón directed Harry Potter and the Prisoner of Azkaban (2004).
* Mike Newell directed Harry Potter and the Goblet of Fire (2005).
* David Yates directed the remaining five films: Harry Potter and the Order of the Phoenix (2007), Harry Potter and the Half-Blood Prince (2009), Harry Potter and the Deathly Hallows – Part 1 (2010), Harry Potter and the Deathly Hallows – Part 2 (2011), and Fantastic Beasts and Where to Find Them (2016).
So, while Chris Columbus is the most associated with the series, it was a collaborative effort from several talented directors.