Symbian Foundation head Lee Williams has stepped down from his role effective Tuesday, the company said in an official statement. Williams, whose title was Executive Director, has been replaced by former Chief Financial Officer Tim Holbrow. Symbian is majority-owned by Nokia, a company that is no stranger to shakeups at the top — the Finnish manufacturer recently named a new CEO and shuffled several executive roles. Nokia also lost its head of mobile solutions last month when Anssi Vanjoki resigned. Despite all this turmoil and a constant stream of criticism from media, blogs and even users, Nokia’s Symbian OS remains the most popular smartphone operating system in the world by a significant margin. Hit the jump for the Symbian Foundation’s full statement.

The Symbian Foundation is today announcing that Lee M. Williams has stepped down from his position as Executive Director for personal reasons. We thank Lee for his work over the past two years and wish him all the best in his future ventures.

The Board of Directors has appointed Tim Holbrow, formerly the Symbian Foundation’s CFO, to the position of Executive Director with immediate effect. We congratulate Tim and welcome him to his new role.

Zach Epstein has worked in and around ICT for more than 15 years, first in marketing and business development with two private telcos, then as a writer and editor covering business news, consumer electronics and telecommunications. Zach’s work has been quoted by countless top news publications in the US and around the world. He was also recently named one of the world's top-10 “power mobile influencers” by Forbes, as well as one of Inc. Magazine's top-30 Internet of Things experts.