 Ramba uchiverenga ndima ino - Akakwikwidza mumitambo miviri pa1990 Junior World Championships uye mumitambo mishanu yese pa1991 Junior World Championships, nzvimbo yake yakanakisa iri nzvimbo yechisere mumutambo we1991 wekudzika. Herrmann akakwikwidzawo muWorld Championships ya1996, 1997uye 1999, achinyora imwe nzvimbo yechi14 uye nzvimbo mbiri dzechi20. 