The ins and out at Nokia continue as the firm gears up to adopt Windows Phone, with CTO Richard Green departing to seek out pastures new.

In his place steps former Nokia Research Centre (NRC) head Henry Tirri, who has taken up the position with immediate effect.

Sunny days

"During his time at Nokia, Henry has provided Nokia technical leadership and challenged us to explore forward-looking technologies," said Nokia president and CEO Stephen Elop.

"In his new role, Henry will have the opportunity to make a greater impact and set the course for Nokia and our role in the mobile industry."

Tirri joined Nokia in 2004 as a research fellow before leading NRC Systems Research laboratory in 2007. He'll now be based in Sunnyvale, California.

New pastures

"The company would also like to thank Rich Green for the key role he played in assisting Nokia through a major transition," added Elop.

"We wish him all the best success in his future ventures."

Green took up the position of CTO back in May 2010, and acted as a member of the Nokia Leadership Team from February 2011 onwards.

Nokia claims Green will return to the US to "pursue new opportunities".