Despite limited political experience and some family baggage, Trump’s son-in-law Jared Kushner is playing an active role in virtually every aspect of the New York real estate magnate’s presidential bid. And empowered through his marriage to Trump’s trusted daughter Ivanka Trump, the 35-year-old Kushner operates with an extraordinary level of autonomy within an organization now struggling to shift its focus toward the general election.

Kushner’s growing influence in recent weeks, as described by several people with direct knowledge of his role, has included the selection and vetting of potential running mates, planning for his father-in-law’s transition to the White House, the campaign’s nascent push to incorporate voter data into its strategy, fundraising, and the development of major policies. He also played a hand in writing Trump’s closely watched speech, delivered with the aid of a teleprompter, on Tuesday night meant to reassure jittery Republicans after the candidate’s attacks on a federal judge. Those confidants were not authorized to speak publicly.

The young businessman’s rise adds a new complication to an intense internal power struggle.

Kushner’s background has little to do with politics or public policy, as noted by internal campaign critics who worry he has too much power. Others described Kushner, while inexperienced, as a mild-mannered and valuable presence with helpful connections in the media world and across the Jewish community.

He took over his family’s New Jersey-based real estate firm at the age of 23 after his father, Charles Kushner, went to prison for tax evasion, making illegal campaign contributions and witness intimidation. The younger Kushner later became the publisher of the New York Observer, a Manhattan-based newspaper read largely for its high society and real estate coverage.

“Every publisher in New York has a role in influencing the political debate, from the tabloids to the broadsheets to the community weeklies,” said Mitchell Moss, a professor of urban planning at New York University and an acquaintance of Kushner. “He’s an intelligent and thoughtful young man and he has now surged to the political top through marriage.”

He is also notoriously private.

Kushner, who rarely speaks to journalists despite being a newspaper publisher, declined an interview request through a representative. And even those who work with him regularly in the business world know little about his work on the presidential campaign.

“You wouldn’t know anything about it even if you interact with him multiple times a day like I do,” said Asher Abehsera, CEO of real estate development company LIVWRK. He added, “He’s creative and exceptionally well-connected.”

And as Trump’s senior aides jockey for internal influence, the level of Kushner’s access to the presumptive Republican presidential nominee has surprised campaign officials at times. One aide recalled having a private phone conversation with Trump when he heard Kushner’s voice unexpectedly. Trump was talking on speaker phone, the aide realized, while Kushner was in the room.

Kushner is considered a critic of campaign manager Corey Lewandowski, who has been locked in a months-long power struggle with Trump campaign chairman Paul Manafort.

Kushner has operated largely above the internal feud, acting as a freelance power center across multiple areas of the campaign.

He was part of a Trump delegation that met with House Speaker Paul Ryan’s policy team late last month in Washington, attended an hours-long meeting of Trump’s transition team in New York, joined Trump’s first fundraising swing last month in California, and recently courted opinion leaders such as former secretary of state Henry Kissinger to discuss Trump’s foreign policy. He is also playing an active role in the selection and vetting of Trump’s pick for vice president, expected to be unveiled during the GOP’s national convention next month, and is expected to spend more time traveling with the candidate.

Leveraging his connections to media executives, Kushner also leaned upon his friendship with media mogul Rupert Murdoch to improve the campaign’s strained relationship with the Fox News Channel. And on policy, Kushner had a large hand in crafting a well-received address to American Israel Public Affairs Committee earlier this year. The speech was also reviewed by the Observer’s editor, Ken Kurson, prompting political reporters at the paper to call for a firewall between the paper and any activities for the campaign.

Kurson told The Associated Press that Kushner has “no role” in the Observer’s content.

“We talk often and share many world views. We disagree about some things as well but are always able to discuss respectfully,” Kurson said, describing him as a calm presence.

Kushner took over his family’s New Jersey-based real estate firm in 2004 around the time his father was sentenced to two years in prison in March 2005 according to the terms of a plea deal negotiated by New Jersey Gov. Chris Christie, a prominent Trump backer who previously served as a federal prosecutor.

The younger Kushner pushed the family business into New York City and has purchased nearly $7 billion in property in less than a decade. He married into the Trump family in 2009 at a wedding held at one of the celebrity real estate magnate’s golf clubs in New Jersey. Ivanka Trump converted to Judaism before the wedding and they’re raising their three children as Orthodox Jews.

Trump frequently singles him out Kushner for praise, sometimes even summoning him to center stage at a rally, despite Kushner’s obvious embarrassment.

“Honestly, Jared is a very successful real estate person, but I actually think he likes politics more than he likes real estate,” Trump said at a victory rally last month. “But he’s very good at politics.”