Roger Stone is becoming a prominent figure in the Russia investigation - here are all of his associates Mueller has called for questioning

Jason Sullivan, a social media expert who consulted for Stone's political action committee in 2016, testified before Mueller's grand jury in June.

Reuters reported that Sullivan was served with two subpoenas from Mueller, one requesting his testimony, and the other ordering he provide the special counsel with certain documents and data.

Sullivan, a Twitter specialist, reportedly prepared strategy documents for Stone's PAC advising them on how to maximize their reach and effectiveness on Twitter.

Source: Reuters

Kristin Davis, a close friend and associate of Stone's, testified before a grand jury as part of the the Mueller probe on August 10.

Davis, 41, earned the moniker "Manhattan Madam" when she served time in jail for running an elite prostitution ring that catered to high-end clients in the 2000s.

She's not only good friends with Stone, but has worked for him on and off as a developer for his websites. She and Stone live in the same apartment building in New York City, and Stone is the godfather to her young son.

"She has no knowledge of Russian collusion, WikiLeaks collaboration or any other illegal activity on my part," Stone told The Washington Post. "At the instruction of my attorneys, I have not discussed her testimony with her."

Source: Business Insider

Miller, a close associate and on-and-off aide to Stone, was held in contempt of court by a federal judge in the District of Columbia in August for his refusal to comply with Mueller's grand jury subpoena.

The contempt order came after a separate federal judge rejected Miller's attorneys' legal challenge to the scope of the Mueller probe in a 93-page opinion.

"He's a good father, a devoted husband and a loyal friend," Stone said of Miller in a statement to CNN. "The efforts to squeeze him to bear false witness against me are despicable."

Miller worked as a driver, personal assistant, and social media manager for Stone and his websites.

Sources: Business Insider, CNN

Credico, a talk show host who is allied with Wikileaks founder Julian Assange, allegedly served as an intermediary between Stone and Wikileaks during the 2016 presidential campaign.

On October 5, 2016, Credico posted a selfie of him outside the Ecuadorean embassy in London, where Assange is currently living. Just two days later, Wikileaks released a trove of hacked emails from the account of Clinton campaign chairman John Podesta.

Credico was previously served with a subpoena to testify before the House Intelligence Committee in 2017, but cited his Fifth Amendment right against self-incrimination.

"My speculation is that they probably want to talk to him about Roger Stone and Julian Assange," Credico's attorney Martin Stolar told CNN in August of the Mueller subpoena.

Source: Business Insider

John Kakanis, 30, has reportedly worked for Stone as a driver, accountant, and assistant. Mueller's team ordered him to appear before a grand jury in May, but his testimony has not yet been scheduled.

Reuters reported that Kakanis has also been questioned by the FBI on topics including Stone's contacts with Wikileaks and Guccifer.

During the Republican presidential primaries, one of Stone's PACs paid a firm registered under Kakanis' name for “voter fraud research and documentation” and “research services consulting."

Source: Reuters

Jerome Corsi, a Stone ally and right-wing conspiracy theorist, was initially set to testify before the grand jury on Friday along with Credico, but his lawyer announced at the last minute that Corsi would not, in fact, be testifying.

Stone told Business Insider he believed Corsi had been subpoenaed to testify on the subject of a March 2017 piece Corsi wrote for the conspiracy theory site Infowars.

In the article, Corsi argued that the information that spurred Stone's cryptic tweets on Podesta days before Wikileaks released a trove of his emails came from research Corsi had conducted himself, not any coordination between Stone and Wikileaks.

Corsi's lawyer John Gray previously told Buzzfeed he was trying to arrange a voluntary sit-down between his client and Mueller, which would negate the need for grand jury testimony.

Source: Business Insider, Buzzfeed