Date of Birth: 
About Matthias Siejkowski
- Maciej Siejkowski (born 12 December 1967) is a Polish/German rower.
- He formerly held the world record for 2000 m on an indoor rower, which he first set in a time of 5:39.7 at the World Indoor Rowing Championship in 1997, and later reset with a time of 5:37.0 in Warsaw, Poland on 1 December 2001 in Warsaw, Poland.
- The current record of 5:36.6 was set by Rob Waddell in 2007. Siejkowski is the last man to officially hold the record for 2500 m on an indoor rower with a time of 7:15.5, which he set at the 1989 World Indoor Rowing Championship.
- In 1996, the World Indoor Rowing Championship changing the official distance of record from 2500 m to 2000 m.
- This brought the event in line with the on the water distance of record.
- As a result, records for the 2500 m distance are no longer maintained. He is now a member of "AZS Politechnika Wroclaw" rowing club.
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