Kevin Mandia, chief executive officer of the cybersecurity firm FireEye, testifies before the Senate Intelligence Committee in 2017. Mandia’s company was the first to sound the alarm about the massive hack of government agencies and private companies on Dec. 8.

Kevin Mandia, Chief Executive Officer of FireEye, testifies before the Senate Intelligence Committee hearing on Capitol Hill in Washington, Thursday, March 30, 2017, on Russian intelligence activities. (AP Photo/Susan Walsh)