Jon Greenberg is a senior correspondent with PolitiFact. He was part of the PolitiFact team during the 2012 presidential election and was one of the fact-checkers who launched PunditFact in 2013. Prior to that, he was executive editor at New Hampshire Public Radio and a Washington reporter for National Public Radio. He has twice won awards from the Society of Professional Journalists for investigative reporting.

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Recent stories from Jon Greenberg

The Fredo flap and the nuances of an insult

CNN host Chris Cuomo stirred up a tweetstorm when he exploded at a man who called him Fredo. Cuomo called it slur on Italian Americans. Language has more twists than that would suggest.

Explaining the Jeffrey Epstein conspiracy theories linked to Trump, Clinton

The details of Jeffrey Epstein’s apparent suicide have yet to come into full view, but that did nothing to stem the tide of misinformation coursing through social media channels.

Fact-checking claims about the mass shootings in El Paso and Dayton

In the days since the mass shootings in El Paso and Dayton, we’ve heard a lot from people seeking to shape the gun debate with their own theories, facts and figures.  With so much going on, it might be hard to keep all of it straight. We recapped our fact-checking of politicians, pundits and social media here.

That viral tweet about mass shootings by country? It needs additional context

A tweet said the US has had 249 mass shootings this year, while Mexico had just three, and many other countries even fewer. Two problems: There's no standard defiintion of these events, and no hard data globally.

In a messy Democratic presidential debate, facts about Medicare for All get tossed about

Candidates used their varying degrees on how to achieve universal coverage — whether through Medicare for All or more incremental steps — as a means to differentiate themselves from the field.

Fact-check: How House members exaggerated facts in questioning Robert Mueller

Robert Mueller appeared publicly to repeat findings from his report on Russian interference in the 2016 election and President Donald Trump’s reaction to the investigation.

Fact-checking Trump’s misleading attacks on Omar, Ocasio-Cortez in North Carolina

In a North Carolina rally, President Donald Trump misled about statements by Ilhan Omar and Alexandria Ocasio-Cortez

"If you like your plan, you can keep it." Biden’s health pitch invokes Obama's troubled claim

Joe Biden says under his healthcare plan, people can keep the plans they have now. That sidesteps the ways that their plans could change.

Health care gets heated on night 2 of the Democratic presidential debate

Though the candidates tended to agree on the end goal of universal coverage, differences emerged over how to get there.

‘Medicare for All' emerges as early divide in first Democratic presidential primary debate

Only two candidates went all-in for single-payer.