De Beck tụgharịrị na egwu na 1983 ma merie nke atọ (na nke ikpeazụ) aha Belgian nke ọrụ ya site na ịgba ọsọ 29:42.56 nkeji maka mita 10,000. Afọ ikpeazụ ya nke asọmpi ukwu bịara na 1987: ọ kwụsịrị 73rd na 1987 IAAF World Cross Country Championships
ma merie Marathon Zwijndrecht na oge nke 2:21:50 awa.