The post, written by Google CEO Larry Page, marked the end of a long process that began in August when the $12.5-billion deal was announced.
"Motorola is a great American tech company that has driven the mobile revolution, with a track record of over 80 years of innovation, including the creation of the first cell phone," Page wrote.
The blog also announced that Motorola Mobility's Sanjay Jha will step down as CEO and make way for Google's Dennis Woodside to lead the cellphone company.
Woodside, Google's president of the Americas region, has already begun work with the company, "with some very strong new hires," according to the post.
"I've known Dennis for nearly a decade, and he's been phenomenal at building teams and delivering on some of Google’s biggest bets," Page wrote.
The blog closed with a statement regarding the importance of smartphone, likely shedding some light on the reasoning behind Google's purchase of Motorola Mobility.
"Many users coming online today may never use a desktop machine, and the impact of that transition will be profound -- as will the ability to just tap and pay with your phone," Page said. "That's why it’s a great time to be in the mobile business."