David Klemmer was born on December 22, in Sydney, New South Wales.
He attended Westfields Sports High School where he played Australian Schoolboys in both 2010 and 2011.
He played his junior football for the All Saints Toogabbie Tigers before being signed by the Canterbury-Bankstown Bulldogs at age 15.
Klemmer also played AFL and was apart of the Sydney Swans academy.
KLEMMER SIGNS FIVE YEAR DEAL
In 2011, he was part of the Bulldogs 20s team in 2011 and 2012 where he played 28 games and featured in the New South Wales under 18s side.
At the end of the 2012 season, Klemmer was named 20s Player of the Year and part of the Team of the Year.
Klemmer made his NRL debut for the Bulldogs in Round 1 of the 2013 season against the North Queensland Cowboys.
He only played four games in his first season in the NRL but captained the NSW team in the under 20s State of Origin.
In Round 4 of the 2014 season, Klemmer scored his first try.
It was against the Melbourne Storm in the Bulldogs' 40-12 win at nib Stadium in Perth.
He was then selected on the bench to play for City Origin in the City vs Country match.
He featured in the Bulldogs 2014 NRL Grand Final against the South Sydney Rabbitohs where he came off the bench.
To cap off a fantastic 2014, Klemmer made his international debut for Australia against England.
He came off the bench in their 16-12 victory.
In 2015, Klemmer made his State of Origin debut for NSW in the series opener against Queensland.
He came off the bench in the Blues' 11-10 loss.
He played in all three games in that State of Origin series.
In 2016, Klemmer featured in three games for NSW and was also selected to play in the Prime Minister's XIII against Papaua New Guinea.
He was then selected in the 24-man Australian Kangaroos squad for the Four Nations where he played five matches.
In 2017, Klemmer started at prop for Australia in the ANZAC Test against New Zealand.
Klemmer again played all three State of Origin games off the bench and was named the winner of the Brad Fittler Medal for best player of the series.
At the end of the 2017 season, Klemmer was selected in the 24-man squad for Australia's World Cup.
Klemmer played in all six matches of the World Cup.
It was a competition Australia won.
In 2018, Klemmer was part of the Blues' 2-1 series win against the Maroons, breaking a three-year drought.
He played two matches for Australia in 2018.
At the end of 2018, Klemmer signed a five-year-deal with the nib Newcastle Knights.