Date of birth
The 6'6 striker joined Town in January 2016 from National League side Forest Green, as he penned an 18 month deal with the Club.
Earlier in the 2016/17 campaign, Kieffer had joined Torquay United on loan, where he scored five times in four matches.
He has experience of playing in the Championship with Yeovil in the 2013/14 season, where he netted four times in 20 appearances.
Kieffer joined Rotherham on a season-long loan for the 2017/18 campaign along with defender, Josh Emmanuel.