A right winger, he spent much of the 1970s with his hometown club Brighton & Hove Albion before moving to Millwall later in the decade. Towner was sold to Rotherham United along with John Seasman for a joint fee of £165,000 in 1980. £95,000 believed to be Towner's fee. He also had a brief loan spell at Sheffield United before moving to Wolverhampton Wanderers for £100,000, where he spent a season in top-flight football. He later played for Charlton Athletic, Rochdale and Cambridge United.
Towner was a skilful, pacy right winger and great crosser of the ball who formed a great partnership with another Rotherham legend Ronnie Moore. Towner was a key figure in Rotherham's 1981 Division 3 winning side.