Cashmore has been involved in investigating the paranormal since the early 1980s. More recently he served as the presenter of the Discovery Channel's Ghosthunters programme, which was shown initially in the UK and Europe before being sold to worldwide networks. In 2004 he also helped pilot the US version of the show Ghost Hunters.
Ghosthunters is also currently aired in on Discovery's DMAX channel throughout Europe at differing times, and is shown in the UK on Discovery DMAX (SKY 144) on Friday nights at both 10pm and 10.30pm.
He was also the paranormal expert for the Sally Jessy Raphaël radio show in the USA, and a regular contributor for the BBC in the UK, and independent television and radio. He also often doubled as a guest producer for BBC regional radio in the UK. Ian's grandfather was Denis William Cashmore who played professionally for Watford Football Club.