In 2008, Rosser launched a beer called Skinny Blonde along with winemaker Richie Harkham and artist Jarod Taylor. The beer won the Peoples Choice awards at the 2008 Australian Beer Festival held at the Rocks in Sydney.

In June 2009, Skinny Blonde attracted national controversy across Australia over its beer bottle packaging which, through the use of modern ink technology, has a 1950s style pin up girl called ‘Daisy’ on the beer bottle label, slowly revealing herself as the beer level drops and the bottle temperature rises. This angered feminists who claimed the beer was “another blatant example of the alcohol industry objectifying women to move product”. In response, Rosser stated,

Rosser was asked to join The Vines to replace the band’s previous drummer, David Oliffe. He left the Vines, along with guitarist Ryan Griffiths, in December 2011.

In 2011, Rosser was living in Redfern, New South Wales.

Rosser started touring with Australian hard rock band Wolfmother in 2012, where the band were looking to start working on their third studio album. After a year of touring with the band, Wolfmother split up temporarily while frontman Andrew Stockdale worked on his solo album Keep Moving. Rosser performed drums and percussion on several tracks for the album. However, before embarking on a tour for the album, Stockdale reformed Wolfmother and prepared a tour under the band’s name instead performing both Wolfmother and his solo tracks.

Rosser and his wife Kirsty have one child, Oscar Rosser, born in June 2012 in Queensland, Australia.

Rosser left the band in 2013, then rejoined in 2017.