In 1997 his personal best time was 8:37.35 minutes. The next year he sensationally won the European Championships, lowering his personal best time to 8:13.10 minutes. He then won the steeplechase event at the 1998 IAAF World Cup.
In August 1999 he ran in 8:09.48 minutes in Zurich, beating the old German record of Hagen Melzer. This German record still stands. He finished fourth at the World Championships the same year, and fifteenth at the 2000 Summer Olympics.
- "Sensations-Gold für Kallabis". ARD (in German). 1998-08-23. Retrieved 2007-05-31.
- Microsoft Word - Ewige DLV-Bestenliste.doc Archived July 4, 2007, at the Wayback Machine.
- German championships, men's 3000 m steeplechase
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