 In 2001 Don Panoz purchased PSCR to solidify the sanction for Panoz's American Le Mans Series (ALMS) which had been sanctioned by PSCR since 1999.Panoz renamed the sanctioning organization IMSA, and it was the official sanctioning body of the American Le Mans Series, the Star Mazda series, and the Panoz GT Pro series.The ALMS uses regulations based on those of the 24 Hours of Le Mans, but in 2005 the relationship between Panoz and the Le Mans organizers, ACO, became problematic.