 Vernon akatanga kupinda mumakwikwi epasi rose emutambo wenhabvu muna 2004 paIAAF World Cross Country Championships kwaakakwikwidza mumakwikwi evarume vechidiki emamita zviuru zvisere; achipedza ari wechi64 munguva yemaminitsi 27 nemasekondi gumi nemaviri. Makwikwi anotevera aVernon epasi rose aive 2005 IAAF World Cross Country Championships kwaakakwikwidza zvakare mumakwikwi evarume vechidiki, panguva ino achipedza 48th. Pa2005 European Athletics Junior Championships akakwikwidza mumakwikwi e5000metres; achipedza wechina munguva yemaminitsi gumi nemana nemasekondi makumi maviri nemanomwe. Muna Zvita 2005 akahwina menduru yake yekutanga yepasi rose muEuropean Junior Cross Country Championships achipedza wechipiri kuseri kweHungary Barnabás Bene. Akabva apinda mumakwikwi eEuropean Cross Country Championships muna 2007 uye akapedza ari wechitatu munhangemutange yevarume vari pasi pemakore makumi maviri nematatu. Muna 2007 European Athletics U23 Championships Vernon akakwikwidza mu5000metres uye akapedza wechinomwe munguva ye13minutes uye 59.24seconds. Vernon akakwikwidza mu2008 World University Cross Country Championships, achipedza ari wechitanhatu. Uyewo muna 2008 kwaiva 2008 IAAF World Cross Country Championships apo Vernon akapedza 115th ari 12kilometers mukuru varume nhangemutange. Makwikwi ake makuru anotevera aive 2008 European Cross Country Championshipsuko akakwikwidza munhangemutange yevarume vari pasi pemakore 23. Akapedza ari wechipiri achitevera muItaly Andrea Lalli. Vernon akakwikwidza mumakwikwi ake eChina World Cross Country Championships mugore ra2009. Akakwikwidza munhangemutange yevakuru uye akapedza ari wechi78. Muna 2009 European Cross Country Championships muDublin Vernon akakwikwidza mumakwikwi evarume vakuru; kupedza 12th. 