YouTube co-founder Chad Hurley is stepping down as chief executive of the online video-sharing website.
Google bought the YouTube website in 2006 for $1.65bn (£1.03bn) and since then has been asserting more control over the popular site.
In a statement, Mr Hurley said Google's Salar Kamangar had led YouTube's daily operations for the past two years while he had worked in an advisory role.
Mr Hurley said he would continue to serve as an adviser to YouTube.
Mr Hurley founded YouTube in 2005 with Steve Chen and Jawed Karim. His co-founders have already left the firm.
Mr Kamangar will take over as YouTube CEO.