|Born||15 September 1971|
Thomas was an allround speed skater, but favored the shorter distances. The years 1995 and 1996 found her at her peak: in both those years she was Dutch allround champion as well as Dutch sprint champion and came in second at the European Allround Championships behind Gunda Niemann. She was third in the 1995 World Allround Championships in Savalen and in 1996 won both the 1000 and 1500 m in the inaugural World Single Distance Championships in Hamar.
On 20 March 1999 in the Olympic Oval in Calgary, she broke the world record in 1500 m. by 1.5 seconds, skating in 1.55.50. That weekend she also broke the world record for the combined times for the 500, 1000, 1500 and 3000 m in one tournament (the "mini combination") and reached 4th place in the adelskalender.
She retired from competitive skating in November 2006.
|Women's speed skating|
|500 m||38.97||26 January 2002||Utah Olympic Oval, Salt Lake City|
|1000 m||1:15.20||17 February 2002||Utah Olympic Oval, Salt Lake City|
|1500 m||1:55.50||20 March 1999||Olympic Oval, Calgary||World record until beaten by Anni Friesinger on 4 March 2001|
|3000 m||4:11.45||6 February 1999||Vikingskipet, Hamar|
|5000 m||7:16.97||7 February 1999||Vikingskipet, Hamar|
|Small combination||163.901||23 March 1996||Olympic Oval, Calgary|
|1500 m||1:55.50||20 March 1999||Olympic Oval, Calgary|||
|Small combination||158.183||21 March 1999||Olympic Oval, Calgary|
|Dutch Single Distance Championships||4||5||6|
|Dutch Sprint Championships||2||3||1|
|Dutch Allround Championships||3||1||2|
|European Allround Championships||0||2||1|
|World Single Distance Championships||2||0||0|
|World Allround Championships||0||0||1|