Stein has been acting CEO since March 2014, having previously served as the company’s CFO since July 2004.
Stein has also been appointed to the board of directors and will continue to act as CFO while the company searches for a permanent successor. The company stated that there had been an improvement in return on invested capital since Stein took over as interim CEO.
“Bill has a clear strategic vision for the company's future, a strong track record of sound financial stewardship and a big-picture understanding of the future of our industry. With this appointment, the board looks forward to working with Bill to build on our recent momentum and to help guide Digital Realty to the next level and scale of operational sophistication," said Digital Realty’s chairman Dennis Singleton.