Dean Geyer was born in South Africa on the 20th March 1986, and was brought up within the country. Born into a family with two sisters, Geyer and his family lived in South Africa until 2001, when their family emigrated to Australia. Geyer commenced his schooling in Australia by going to Melbourne High School.
Geyer's family had a strong connection to martial arts, with members from previous and current generations attaining 'black-belts' in karate. Following in family tradition, Dean also ascertained his black-belt several years prior to his Idol debut.
Geyer's interest in music started during his early teens. He learnt to play the guitar, and his ability was showcased during the Australian Idol audition where he played a self-composed piece entitled "Nice To Meet You".
He has also been involved in modelling.