Kammala wannan jumla: A 2005 ICF Sprint Canoe World Championships, Johnson ya gama 8th a cikin K-1 500 m da 8th a cikin K-1 1000 m. A Gasar Cin Kofin Duniya ta ICF ta 2006, Johnson ya gama na 6 a K-1 500 m da na 7 a K-1 1000 m. A cikin
2007 ICF Sprint Canoe World Championships, Johnson ya gama na 4 a cikin K-1 1000 m da na 5 a cikin K-1 500 m. A Gasar Cin Kofin Duniya ta ICF ta 2010, Johnson da abokin aikinta Krisztina Fazekas-Zur sun gama na 10 a cikin K-2 500 m, suna cin nasarar B-final.