Fatt was also known for falling asleep on stage, causing the other members (and later on the audience) to utter the iconic Wiggles catchphrase "Wake Up, Jeff!

[6] He opened a public address equipment business with his brother in Sydney when he began playing keyboard for the rockabilly band the Roadmasters, and was recruited by Anthony and Paul Field to join the Cockroaches.

After The Cockroaches disbanded in the early 1990s, Anthony Field asked Fatt, who was renovating his house at the time, to help them record The Wiggles' first album in 1991.

[11] As Sam Moran has said, when referring to the development of the Wiggles' shticks, "Jeff really does fall asleep",[12] and Fatt reported, "The irony is I'm a very light sleeper in the nighttime.

[13] Fatt was the only member of the Wiggles without a background in early childhood education; he stated that was the reason falling asleep was chosen as his schtick, "because it was a way of getting me involved in the shows without actually having to do anything".

[16] Anthony Field reported that although in the early days of the group, they took turns falling asleep, it became Fatt's schtick because "it was a perfect fit".

As a result, Fatt decided to temporarily replace Gillespie to film The Wiggly World Of Dance Classes, a four-part series.

[7] Fatt was featured on the fourth episode of the twelfth season of Who Do You Think You Are?, where it was revealed that his maternal grandfather, David Yong Yee, immigrated to Sydney, Australia in 1896, becoming a prosperous banana businessman.

In 1909, David and his family moved to Hong Kong where they were involved in the creation of the Chen Kwong company, a successful Chinese-Australian retail store and one of the first of its kind.

His paternal great-great-grandmother, Elizabeth Wright, was born in Middlesex, England and arrived in Melbourne, Australia in 1853 as a domestic servant.

Joseph died a year later in August 1901 and was survived by Emma and their four children, who returned to Ballarat, then Burwood, before eventually settling in Concord West.

[23] In what Paul Field called "one of the highlights of their 15 years of being together",[24] Fatt, along with the original members of the Wiggles, was awarded an honorary doctorate degree from Australian Catholic University in 2006.

[25] Fatt, along with the other three original Wiggles,[22] was made a Member of the Order of Australia (AM) in January 2010 "for service to the arts, particularly children's entertainment, and to the community as a benefactor and supporter of a range of charities.