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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.

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Methodology: How We Tested an Aggression Detection Algorithm

An in-depth look at software that claims to spot aggression from your voice.

Aggression Detectors: The Unproven, Invasive Surveillance Technology Schools Are Using to Monitor Students

In response to mass shootings, some schools and hospitals are installing microphones equipped with algorithms. The devices purport to identify stress and anger before violence erupts. Our testing found them less than reliable.

Prosecutors Dropping Child Porn Charges After Software Tools Are Questioned

More than a dozen cases were dismissed after defense attorneys asked to examine, or raised doubts about, computer programs that track illegal images to internet addresses.

“Happy to Do It”: Emails Show Current FAA Chief Coordinated With Ex-Lobbyist Colleagues on Policy

As he moved through the agency’s ranks, the now-acting FAA Administrator Dan Elwell exchanged dozens of emails with lobbyists and other industry players discussing everything from rolling backing back consumer protections to airport privatization.

Facebook Won’t Let Employers, Landlords or Lenders Discriminate in Ads Anymore

The sweeping changes come two years after ProPublica’s reporting, which sparked lawsuits and widespread outrage.

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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