Frank Stronach, the Canadian billionaire founder of Magna International, has been convicted of sexual assault and indecent assault in cases dating back several decades, according to a ruling delivered Friday by Justice Anne Molloy of the Ontario Superior Court of Justice in Toronto. The 93-year-old businessman was found guilty in two instances while being acquitted of three additional sexual assault charges involving two other women.

The convictions stem from allegations spanning the 1970s through the 1990s, with the charges involving women connected to Magna or other companies controlled by Stronach. One indecent assault conviction involved a 1977 incident with a social acquaintance who testified that Stronach lifted her skirt at his apartment after dinner when she was 25. Justice Molloy described his behavior as “quite simply, gross and disgusting conduct.” Another conviction arose from testimony by a woman who said Stronach groped her at his condominium in the 1980s after a dinner meeting about her dismissal from a restaurant he owned.

The court acquitted him on three charges, with Justice Molloy citing an inability to determine whether the woman involved had consented to sexual activity. Prosecutors had withdrawn five charges after the trial began in February. Stronach is expected to face an additional sexual assault trial next year.

Stronach’s legal troubles mark a significant fall from grace for the entrepreneur best known for building Magna International from a small garage operation into a global auto parts and vehicle assembly manufacturer. Founded in the 1980s, Magna expanded its reach by assembling vehicles for major automakers, including Mercedes-Benz, and attempted to acquire Chrysler and General Motors’ European division, Opel.

Throughout his career, Stronach has been known for making controversial public remarks. In 2007, during a Magna annual shareholder meeting, he sparked criticism by asking who was more attractive to women—himself or his longtime aide Manfred Gingl.

While these controversies did not notably impact Magna’s business success, investor concerns eventually led to Stronach relinquishing control of the company in 2010 in exchange for approximately $1 billion. Since then, he has had no involvement with Magna.

Beyond his business endeavors in Canada, Stronach founded the pro-business Team Stronach party in Austria, which briefly gained two seats in the Austrian state parliament in 2013 before dissolving. His daughter, Belinda Stronach, a former Canadian cabinet minister with whom he is reportedly estranged, now oversees the Stronach Group, a horse racing and gambling enterprise that includes Gulfstream Park in Florida.