He set his world record for the 110 metres hurdles on 20 August 1993, winning his first World Championships gold medal in Stuttgart, Germany in 12.91 s. The new mark (also a championship record) shaved 0.01 s off the previous record held by Kingdom and stood for nearly thirteen years, only being equalled by Liu Xiang in the 2004 Summer Olympics and finally beaten by the same man on 11 July 2006 at the Super Grand Prix in Lausanne with a time of 12.88 s. Jackson remained the sole holder of the indoor world record at the 60 metres hurdles with a time of 7.30 seconds set in Sindelfingen, Germany on 6 March 1994 until February 2021. At the 1994 European Indoor Championships he became a double European champion: winning in both the 60 metres hurdles and 60 metres sprint race as well. His 60 m dash time of 6.49 s was a European record, as well as a championship record. These records remained unbeaten for 5 years, when Jason Gardener ran 6.46 s in 1999 in Maebashi, Japan.