Left-wing Swiss billionaire Hansjorg Wyss proposed ‘threesomes’ with female worker and future hubby, wild sex harassment suit claims

A top financial backer of left-wing causes in the US has been accused of sexually harassing a female employee, pushing for “threesomes” with her and her future husband while they worked at his California winery — and then retaliating against them for calling out his “lewd” conduct.

Swiss billionaire Hansjorg Wyss exposed himself, “brazenly groped,” and made other unwanted sexual advances toward Madison Busby before forcing her to resign her job, according to a jaw-dropping lawsuit filed April 25 in San Luis Obispo County Superior Court.

Busby, 30, met her now-husband Bryce Mullins in 2019, when he was helping Wyss manage the 2,700-acre winery, Halter Ranch. The two later began dating and moved in together on the Paso Robles property.

“Through all these years, they never complained about the owner’s conduct, or simply declined to spend so much time with him, until after they voluntarily left their employment at the winery in 2024,” a rep for the winery said in a statement.

“The allegations in the complaint are not true and we intend to vigorously advance the facts that surround their time at the winery and their departure.”

Mullins filed a separate suit April 1 alleging that Wyss fired him after Busby complained about the sexual misconduct in a private email to the billionaire — and reneged on providing him up to $30 million in equity interest in Halter Ranch after Mullins had operated the winery for six years, starting when he was just 26 years old.

Wyss purchased the property in 2000 and later opened other Halter Ranch wineries in Temecula, Calif., and Fredericksburg, Texas, all three of which are currently valued at roughly $100 million, per Mullins’ suit.

An architect by training, Busby went to work for Wyss as a project manager alongside Mullins, who served as Halter’s general manager, from January 2021 to July 2024 — during which time the billionaire “began trying to insert himself into their sex lives,” the civil suit claims.

Early on, Wyss “shared unwelcome stories about his sexual exploits and various affairs,” said “how much he enjoyed having a threesome, even with another man,” and suggested once “if Bryce is not behaving, you can join me in bed,” according to the Busby suit.

The “abusive and predatory behavior” also included asking Mullins for “sexy” photos of Busby — and even groping her butt before she started working for him in September 2019, the suit alleges.

Wyss eventually floated a “foursome” with the couple and another friend of his named “Lori” and even subjected Busby to a live phone sex Facetime call between himself and the woman, the suit goes on.

He went on to grill Mullins and Busby “about their sexual preferences and experiences with each other” and “asked Ms. Busby about her favorite sexual positions,” the filing adds.

The couple initially lived rent-free in a house on the property that Wyss would visit — but after they had their first child and Busby went onto maternity leave in 2023, Wyss began asking for $1,650 in monthly fees, according to the complaint.

When Busby returned from maternity leave, Wyss docked her annual pay to $65,000 from $75,000.

In July 2024, Busby denounced the “unreasonable expectations” and “inappropriate behavior and misconduct” Wyss had inflicted on her and her husband in an email to her employers, eventually resigning from “her own anxiety and distress,” according to the complaint.

Wyss had admitted two years prior to Busby that “if you ever went after me for sexual harassment, you would win,” the suit revealed.

Busby’s complaint alleges sexual harassment, retaliation, wrongful termination, infliction of emotional distress, sexual battery and demands she’s entitled to compensation for damages “including lost earnings, back-pay, future-pay, lost employment benefits, and unpaid wages.”

“For almost five years, starting in 2019, Mr. Mullins and his current wife voluntarily made themselves part of the Halter Winery community and took advantage of its owner’s generosity,” a rep for the property added in the statement.

“This included deciding to become employees of the winery, choosing to live at the winery rent free for years, frequently traveling with the owner to Europe, the Caribbean and elsewhere at the owner’s expense, asking the owner and his wife to host their wedding party and inviting the owner to serve as Best Man.”

This isn’t the first time the lefty billionaire has been hit with allegations of sexual misconduct. In 2013, Wyss settled out of court for $1.5 million with a Colorado woman who claimed she suffered sexual abuse for years as one of the employees at his foundation, the Daily Caller reported.

Wyss amassed a fortune after selling the medical device company Synthes for nearly $20 billion to Johnson & Johnson in 2012.

He’s funneled millions of dollars to environmental nonprofits and other philanthropic efforts through the Wyss Foundation as well as to the Sixteen Thirty Fund and the New Venture Fund, both of which are part of a dark money network run by Arabella Advisors.

As a foreign national, Wyss isn’t allowed to donate directly to candidates for US elections but still managed to pump cash into left-wing causes and campaigns from 1990 to 2006, according to the Associated Press.

“The Wyss Foundation and Berger Action Fund have no involvement with this matter,” a spokesperson said. “The organizations’ charitable activities are totally separate from those of the Halter Ranch.”