Head of Google's Android division Andy Rubin has been replaced by Sundar Pichai, who manages Google Chrome and Apps.
The firm's chief executive, Larry Page, wrote in a blogpost that Rubin "has decided to hand over the reins and start a new chapter at Google."
His replacement Pichai runs Google Chrome and Apps. So, this move brings the company's mobile and desktop operating systems under the control of the same person, the Telegraph reports.
Rubin was co-founder and chief executive of Android Inc until Google bought the firm in August 2005.
Since then he has been Google's senior vice president of mobile and digital content.
According to the paper, Page did not say what Rubin's new role would be, but he said the Android creator had 'exceeded even the crazy ambitious goals we dreamed of'.
Page also said that Pichai would "do a tremendous job doubling down on Android".