Rubuta ci gaba don wannan sakin layi - Yayin kammala aikin matasa a gasar Hockey ta Yamma (WHL) tare da Yarima George Cougars, Mason an fara zana shi a 122nd gaba ɗaya a cikin 1995 NHL Entry Draft
ta hanyar New Jersey Devils. Da yake fara aikinsa na sana'a kuma ba a sanya hannu daga aljanu ba, Mason ya sanya hannu a matsayin mai kyauta ta Mighty Ducks na Anaheim a ranar 27 ga Yuni, 1997. Bayan kakar wasan sa na farko tare da kungiyar Ducks ta American Hockey League (AHL), Cincinnati Mighty Ducks, kuma a jajibirin kakar wasa ta biyu, Anaheim ta yi musayar Mason tare da Marc Moro zuwa Nashville Predators a musayar Dominic Roussel.