Kooiman made his debut in the Speed Skating World Cup at the beginning of the 2014/15 season in Seoul . There he won the B-World Cup over 10,000 m. In November 2014 he was third in the Dutch championships over 10,000 m. At the individual distance world championships in 2015 in Heerenveen , he won the silver medal over 10,000 m. In the 2015/16 season he came in the top ten at all five World Cup starts and thus achieved ninth place in the overall World Cup over 5000/10000 m. In December 2015 he took second place over 10,000 m at the Dutch Championships in Heerenveen. At the individual distance world championships in 2016 in Kolomna , he won the bronze medal over 10,000 m.
Personal bests
500 m 40.35 sec. (installed on March 19, 2016 in The Hague)
1000 m 1: 29.52 min. (drawn up on March 29, 2003 in The Hague)
1500 m 1: 52.17 min. (installed on October 18, 2015 in Inzell)
3000 m 3: 47.08 min. (installed on March 5, 2016 in Heerenveen)
5000 m 6: 17.95 min. (installed on November 13, 2015 in Calgary)
10000 m 12: 58.24 min. (installed on November 21, 2015 in Salt Lake City)
Netherlands
