The striker joined Barnsley in the January transfer window of 2018, signing from Ipswich Town for an undisclosed fee on a three-and-a-half year deal.
Having made his name in non-league, Kieffer previously enjoyed a season in the Championship with Yeovil back in the 2013/14 campaign.
But it was his displays with Forest Green in 2016 that brought him back to the attention of league clubs, seeing Ipswich sign him in January of 2017.
However, he couldn't force his way into the reckoning at Portman Road and so he spent the first half of the 2017/18 season on loan with Rotherham United in League where his 13 goals before January of 2018 saw the Reds swoop to bring him to Oakwell.
His best efforts weren't enough to stave off relegation but Moore was again in the goals in the third tier, proving to be a real handful for opposing defenders and a real asset for the Reds in their successful quest to regain their Championship status.