Plesco shows a timeline of the SolarWinds hack on his computer.

Ron Plesco, an attorney with global law firm DLA Piper, reviews the timeline of the SolarWinds hack in Philadelphia, Pa. on Wednesday, April 7, 2021. Plesco, who has decades of experience working in cybersecurity, is part of a team hired by SolarWinds. It was discovered last December that the information technology company’s software was exploited by malicious code in what is considered one of the biggest hacks in history, resulting in the expsoure of information from top Fortune 500 companies and multiple US government agencies. Credit: Kriston Jae Bethel for NPR