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Jack Gillum

Senior Reporter

Jack Gillum is a senior reporter at ProPublica covering technology, specializing in how algorithms, big data and social media platforms affect people’s daily lives and civil rights. He joined ProPublica in July 2018.

Gillum comes to ProPublica from The Washington Post, where he was part of the investigative team that dug into mismanaged taxpayer funds and troubled relief efforts in Puerto Rico. Prior to the Post, Gillum was an investigative reporter at The Associated Press, where he broke stories on the existence and location of Hillary Clinton’s private email server, as well as a U.S.-backed “Cuban Twitter” program that secretly mined data for political purposes. At the AP, he also covered two presidential races and the world of campaign finance.

Gillum began his career as a business reporter and database specialist at the Arizona Daily Star in Tucson, his hometown. He is a graduate of Columbia University's graduate school of journalism and Santa Clara University in California. He lives in Washington, D.C.

Georgia Officials Quietly Patched Security Holes They Said Didn’t Exist

A ProPublica analysis found that the state was busily fixing problems in its voter registration hours after the office of Secretary of State Brian Kemp, the Republican candidate for governor, had insisted the system was secure.

File-Sharing Software on State Election Servers Could Expose Them to Intruders

A ProPublica analysis found election computer servers in Wisconsin and Kentucky could be susceptible to hacking. Wisconsin shut down its service in response to our inquiries.

The Overlooked Weak Link in Election Security

While attention has focused on the potential to penetrate voting machines, a ProPublica survey found that more than one-third of counties overseeing toss-up congressional elections have email systems that could be vulnerable to hacking.

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