Jha, who revived Motorola's Mobile Devices business and led the company through this acquisition, has stepped down as CEO, although he will continue to work with Google to help ensure a smooth transition.
The acquisition will enable Google to supercharge the Android ecosystem and will enhance competition in mobile computing.
In August, Google said it will buy Motorola Mobility for $12.5 billion -- making it the biggest ever takeover by the Internet giant so far.