Recruited from the Ascot Vale Football Club, Towner made his debut for Essendon Firsts as a reserve in the second home-and-away round match against South Melbourne at the Lake Oval on 2 May 1953.
With a lot of pace across the ground, and strong in the air, he was tried at full-forward as a replacement for the injured John Coleman in 1954; however, once at full-forward, he demonstrated that he was not a very accurate kick (he kicked 23 goals in 9 matches).
Once he was switched to defence, he was highly successful, initially on the half-back flank and, later in his career at Essendon, as the team's regular full-back.
As a full-back, much of his game was centred on his ability to judge and understand the manner in which his full-forward opponent went for the ball; and much of his value to Essendon was his ability to consistently punch the ball out of the hands of a full-forward attempting to mark over his head.
In particular, he always had "the wood" over South Melbourne's Brownlow Medallist Fred Goldsmith, holding him goal-less on several occasions; and it was enthralling as a spectator, to see the tussle between the two — in particular, to see the highly skilled full-back-turned-full-forward Goldsmith getting more and more frustrated each time that the fist of the highly skilled full-forward-turned-full-back Towner came between his own outstretched hands and, yet again, punched the ball 20 metres towards the Essendon goals.