Bill Priestap, and as we have learned – it’s best to also review an individuals spouse while we’re at it.
First, Let’s get a little background information on Bill Priestap
12/2015 – FBI Director James B. Comey named E.W. “Bill” Priestap as the assistant director of the Counterintelligence Division at FBI Headquarters (FBIHQ) in Washington, D.C. Mr. Priestap most recently served as the deputy assistant director of the Intelligence Operations Branch in the Directorate of Intelligence at FBIHQ.
6/2017 – Congress hears sinister tale of Russia election meddling
A sinister portrait of Russia’s cyberattacks on the U.S. emerged Wednesday as current and former U.S. officials told Congress that Moscow stockpiled stolen information and selectively disseminated it during the 2016 presidential campaign to undermine the American political process.
The Russians “used fake news and propaganda and they also used online amplifiers to spread the information to as many people as possible,” Bill Priestap, the FBI’s top counterintelligence official (Assistant Director of the FBI’s Counterintelligence Division), told the Senate Intelligence Committee.
While he said the Russians had conducted covert operations targeting past American elections, the Internet “has allowed Russia to do so much more” than before. But, he added, the “scale and aggressiveness” was different this time, with the primary goal being to sow discord and aid the candidacy of Republican Donald Trump, the eventual winner.
Russia’s actions did not change the final election count, they said, but warned that Moscow’s efforts will likely continue.
“I believe the Russians will absolutely try to continue to conduct influence operations in the U.S.,” which will include cyberattacks, Priestap said. 
Bill Priestap would have needed to authorize Peter Strzok to engage with Christopher Steele over the “Russian Dossier”.
Bill Priestap would have needed to approve of the underlying documents that were used for both FISA applications (June/July and Sept/Oct). Bill Priestap would be the person to approve of paying, or reimbursing, Christopher Steele for the Russian Dossier used in their counterintelligence operation and subsequent FISA application. Without Bill Priestap involved, approvals, etc. the entire Russian/Trump Counterintelligence operation doesn’t happen. Comey’s testimony is also evidence of Priestap’s importance. In addition, when Deputy Attorney General Sally Yates testified (w/ James Clapper), she too spoke of the important of Priestap as her liaison and contact within the FBI on the counterintelligence operation. [Yates never mentioned Peter Strzok – not once.]
Even though it was FBI agent Peter Strzok who interviewed Michael Flynn on January 24th, Sally Yates never mentioned him. EVER. However Deputy AG Sally Yates did talk about Bill Priestap during her testimony. Yates said she and Bill Priestap traveled together, January 26th, 2017, to the White House to inform Don McGhan (WH Counsel) of Michael Flynn “misleading statements” (based on Pence media reports and Flynn prior ambush interview Jan 24th).
According to Sally Yates testimony, she and Bill reportedly presented all the information to McGahn so the White House could take action that they deemed appropriate. So you can see that this man is a central figure. Comey defers to him; Yates relied on him; Strzok reports to him; etc.
Yet there’s no mention of Bill Priestap in any of the explosive investigative story-lines in the past two weeks. Why?
Bill Priestap is FBI Director of Counterintelligence. There’s no way he hasn’t been caught inside the investigative net. Priestap’s boss, Andrew McCabe has been caught. His subordinate, Peter Strzok, has most certainly been caught. And previously FBI Director Comey pushed him in front of the bus.
Either Priestap is going to be the attempted fall-guy for the entire scheme.
Bill Priestap saw the bus coming and is assisting the scheme investigators.
Oops. We don’t want to forgot Bill’s spouse
FBI Director of Counterintelligence is married to Sabina Menshell a self-employed “consultant” with a history of donations to Democrat candidates, specifically to Hillary Clinton.
When practiced by the former, it’s the trade of spooks and spies. In the latter, it’s the job of investigators. Forget about the godda**ed martinis and nice cars. Unless, of course, you’re compelled to look into the irregularities within the liquor and automotive markets.
Now here’s Sabina Menschel with Investigative Due Diligence: Beyond Google. A few months after joining the private investigations firm Nardello & Co., she published one of 2015’s underrated gems that explained the how to of her livelihood. Ms. Menschel certainly knows what she’s writing about given her background.
A veteran of the top corporate intelligence firm in North America with stints in the FBI and Harvard Business School credentials, Menschel was a catch for Nardello & Co., which has offices in North America, Europe, the Middle East, and China.
What Menschel does in her short article is break down investigative work into three broad activities. These are Googling it, looking at public documents, and asking questions. 
 Nardello & Co.