Background
Jefferis was born on 29 August 1985 in Brisbane, Queensland.
Jefferis was born on 29 August 1985 in Brisbane, Queensland.
He was educated at the Anglican Church Grammar School. In November 2010, he completed a degree in Sports Science, and then enrolled in a program that will enable him to become a physiotherapist.
He was an Australian Institute of Sport scholarship holder. Jefferis is 1.55 m (5 ft 1 in) tall and weighs 55 kilograms (121 lb). Jefferis is a parallel bars and rings specialist, starting in the sport when he was only two years old.
He was first coached by Anthony Beake at Y-West.
In 1992 as a seven-year-old with Y-West, Jefferis became part of the Queensland HPC development program and stayed with the program for three years. From 1995 to 2005, he trained and was on scholarship with the Queensland Academy of Sport, before he earned a scholarship with the Australian Institute of Sport in 2005.
Since 2005, he has been coached by Vladimir Vatkin. As of June 2012, he is still on scholarship at the Australian Institute of Sport.
At the 2006, he earned a gold medal in the men"s all around event, a gold medal in the rings, and a silver medal in the team competition.
He competed in the World Championships in 2003, 2005, 2006, 2007, 2010, and 2011. His best performance at Worlds was twelfth place in the all around competition in 2006. In January 2012, Jefferis was passed over by Gymnastics Australia to participate at a London Olympic Games test event.
Jefferis represented Australia at the 2012 Summer Olympics in men"s artistic gymnastics.
He was officially selected on 1 June 2012, one of the first to be named to Australia"s gymnastic squad, and was Australia"s only male artistic gymnast at the Games. Jefferis was twenty-six years old when he made his Olympic debut.
His family faced difficulty getting tickets to watch him compete, as Gymnastics Australia was only able to secure two tickets per gymnast at the Games.
At the 2003 Championships, he was the youngest member of the Australian all around team