In 2005, he admitted paying for sex with a high school student, causing a controversy in Sweden when he was not removed from his position.
In addition to his position at the Supreme Court, also the president of the Arbitration Institute of the Stockholm Chamber of Commerce (Stockholms Handelskammares Skiljedomsinstitut), which he has been a member of since 1989, and vice chairman of the Stock Market Panel ("Aktiemarknadsnämnden").
After having been admitted to the bar association Thorsson was hired as an attorney at Carl Swartling law firm in Stockholm, where he made partner in 1983.
Leif Thorsson is also the recipient of an honorary doctorate degree in law from Stockholm University.
In 2005 Thorsson admitted to paying for sexual favours from a male high school student, a crime in Sweden at the time.