Faatumu le fuaiupu lenei: O le amataga o Vernon i se tauvaga tau afeleti faavaomalo sa i le 2004 IAAF World Cross Country Championships lea na ia tauva ai i le 8,000-mita tauvaga a alii talavou; faaiuina 64th i se taimi o 27minutes ma 12seconds. O le isi tauvaga faavaomalo a Vernon o le 2005 IAAF World Cross Country Championships lea na ia toe tauva ai i le tuuga a alii talavou, o le taimi lenei ua maeʻa ai le 48th. I le 2005 European Athletics Junior Championships sa tauva ai o ia i le 5000metres; faʻamaeʻaina lona 4 i se taimi o le 14minutes ma le 27seconds. Ia Tesema 2005 na ia manumalo ai i lana uluaʻi pine faʻavaomalo i le European Junior Cross Country Championships ma faʻaiʻu lona lua i tua o le Hungarian Barnabás Bene. Ona tauva ai lea o ia i le
2007 European Cross Country Championships ma faʻaiʻu lona 3 i le tuuga a le tamaʻitaʻi i lalo ole 23. I le 2007 European Athletics U23 Championships na tauva ai Vernon i le 5000meters ma faʻaiʻu lona fitu i se taimi o le 13minutes ma le 59.24seconds. Na tauva Vernon i le 2008 World University Cross Country Championships, ma faʻaiʻu lona ono. O le 2008 foi na faia ai le 2008 IAAF World Cross Country Championships lea na faʻauʻuina ai e Vernon le 115th i le 12kilometers senior men's race. O lana isi tauvaga tele o le 2008 European Cross Country Championships lea na ia tauva ai i le tamaʻitaʻi i lalo o le 23 tausaga. Na manumalo o ia i le tulaga lua i tua atu o le tagata Italia o Andrea Lalli. Na tauva Vernon i lana taamilosaga lona fa i le World Cross Country Championships i le 2009. Na tauva o ia i le tuuga a alii matutua ma na faaiʻuina i le 78th. I le 2009 European Cross Country Championships i Dublin, na tauva ai Vernon i le tuuga sinia a tamaloloa; faʻamaeʻaina le 12th.