I might be wrong, but this is the first prime-time mention of Stefan Halper I’m aware of:

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Two days prior to the New York Times article outlining an FBI counterintelligence sting operation to infiltrate the Trump campaign I wrote the following:

I have a sneaking suspicion the Machiavellian connections between the U.S. intelligence apparatus and multiple foreign agents/actors, including the work of Stefan Halper in the 2016 presidential election, are only a few days from fully surfacing. There could be enough sunlight on U.K/U.S. political and intelligence officers to launch multiple investigations.

Well, buckle up, I think today we are going to see and hear much, much more.

…at least one government informant met several times with Mr. Page and Mr. Papadopoulos,… ~NYT

Originally, attention was paid to Glenn Simpson saying in that August 2017 testimony the FBI had some additional ‘inside’ knowledge in addition to Chris Steele’s information. Talk of campaign interlopers increased last week after the DOJ/FBI started stonewalling Devin Nunes and accusing him of trying to reveal the identity of a confidential CIA and FBI source for the 2016 origination of the FBI counterintelligence operation against Trump.

People began connecting Glenn Simpson’s prior 2017 testimony about ‘inside sources’ to the 2018 DOJ statements about exposing CIA/FBI ‘sources’. {See Here} Due to defensive leaks from within the corrupt intelligence apparatus the name Stefan Halper was identified. {See Here} Stefan Halper is a foreign policy expert and Cambridge professor with connections to the CIA and its British counterpart, MI6.

Then came this:

New York Times – […] The F.B.I. obtained phone records and other documents using national security letters — a secret type of subpoena — officials said. And at least one government informant met several times with Mr. Page and Mr. Papadopoulos, current and former officials said. That has become a politically contentious point, with Mr. Trump’s allies questioning whether the F.B.I. was spying on the Trump campaign or trying to entrap campaign officials…

Stefan Halper connects to the same circle of intelligence operatives Christopher Steele used for his sketchy Dossier construct. Halper’s role looks simple: make the low-level Trump campaign aides appear dirty… the CIA would relay that information to the FBI; and the FBI counterintelligence unit (Agent Peter Strzok) would take it from there.

A close circle of politically connected U.S., British, Australian and Russian intelligence insiders begins to back-stop the larger conspiracy. The information provided by the international crew was apparently shaped and funneled by former CIA Director John Brennan to the FBI for domestic political exploitation.