Warren was born in the UK and graduated from Cardiff, South Wales in 1991. Having attained membership of the Royal College of General Practitioners, he came to work in Queensland for a year in 1996. He then settled back in Cardiff, where he worked in his own practice for 17 years, becoming a GP trainer, honorary teacher and senior partner.

The appeal of Australia was always there and having met and married an Australian, he has now emigrated here permanently.