Huisman built his domestic reputation through consistent results in the Dutch Touring Car Championship, winning the title three times — in 1997, 2000, and 2001 — driving a BMW 3 Series. The Dutch championship provided an effective proving ground for European-level ambitions, and Huisman was among the drivers who used its competitive grid as a springboard toward international competition.
His older brother Patrick is also a professional racing driver, making the Huisman family one of the Netherlands' notable motorsport families.
Between 2001 and 2004 Huisman raced in the European Touring Car Championship, the forerunner to the World Touring Car Championship, accumulating experience on circuits across the continent with BMW machinery.
When the series rebranded as the WTCC in 2005, Huisman joined BMW Team UK for the final two rounds of the season — and announced himself emphatically by winning in just his second WTCC race. The victory demonstrated that his domestic success was no accident and that he was capable of competing at world championship level.
In 2006 he committed to a longer WTCC campaign, driving for BMW Team Italy/Spain across just over half the season and finishing thirteenth in the overall standings. It was a solid debut extended season for a driver operating without the factory-level support afforded to BMW's frontrunners.
Later WTCC appearances included a drive for WSR-managed Team Aviva at the Macau round in 2007, and two further rounds in 2008 at Oschersleben with Wiechers-Sport in a BMW 320si.
One of Huisman's most notable achievements came in Macau, where he won the Guia Race four times. The Guia Race is the touring car event held during the Macau Grand Prix weekend on the famous Guia street circuit, a narrow and technical course around the hills of the former Portuguese enclave. Winning there four times places Huisman among the event's most successful competitors and reflects a particular affinity for street circuit racing.
Huisman was part of the winning crew at the 2005 Nürburgring 24 Hours, one of the world's most demanding endurance races. The Nordschleife's 25-kilometre lap demands mechanical reliability, strategic acumen, and the ability to navigate traffic across all conditions at all hours. Victory at the event is considered a significant achievement in European motorsport.
Alongside his touring car commitments, Huisman competed in the FIA GT Championship and the Porsche Supercup, and was runner-up in both the 2010 and 2011 Dutch GT4 Championship. The GT4 results demonstrated that his competitive edge remained strong well into the second decade of his career.
Duncan Huisman represents the strength of Dutch touring car talent that emerged through the country's well-organised national championship in the late 1990s and early 2000s. His combination of domestic dominance, international WTCC appearances, a Nürburgring 24 Hours victory, and four Macau Guia wins makes him one of the more decorated touring car drivers to have emerged from the Netherlands.