Risto Kalevi Siilasmaa (born 17 April 1966) is a Finnish businessperson and the chairman, founder and former CEO of F-Secure Corporation (formerly Data Fellows), an anti-virus and computer security software company based in Helsinki, Finland.

"[10] The transformation of Nokia has also included Siilasmaa renewing the board and the management, with the vast majority of employees newly joining in the company's new phase.

[11][12] In December 2019, Siilasmaa announced to step down as chairman of Nokia's board of directors with then vice chair Sari Baldauf to succeed him in 2020.

He shares the survival strategies and change-management methods he learned by leading people through crisis and steering the company through its wrenching reinvention.

And he explains how the power of paranoid optimism and the precepts of what he calls “Entrepreneurial Leadership” enable leaders to build sustainable success.