Career
Kemkers retired from international competition in 1990 and became a coach. During the 2006 Winter Olympics in Turin, Italy, he coached Ireen Wüst to two medals: 3000 m gold and 1500 m bronze, and Sven Kramer to a silver medal on the 5000 m. During the 2010 Winter Olympics in Vancouver he successfully coached Sven Kramer to the gold medal at the 5000 m and Ireen Wüst to the gold medal on the 1500 m.
During Kramer"s 10 km race, Kemkers made a mistake and guided Kramer to the wrong lane.
Kramer finished first, with a time of 12:54.50 (even though he skated an extra lap in the outer lane) but was disqualified for failing to change lanes. Kramer later said, "At the end of the day, it is my responsibility.
I am the skater on the ice, I have to do it".