Ask the Expert: Federer biographer Rene Stauffer

A sports writer since 1981, Swiss journalist René Stauffer is tennis correspondent for Zurich's Tages-Anzeiger and Sonntags-Zeitung and is the author of the unauthorised Roger Federer biography "Quest for perfection: The Roger Federer Story".

Stauffer first wrote about Federer in 1996 and has since travelled the world covering the former world No.1, attending more than 60 Grand Slam tournaments.

Having interviewed the Fed Express and his family on numerous occasions he knows everything there is to know about the 13-time Grand Slam champion and at 6pm (AEST) on Saturday he’ll be online to answer all your questions about the three-time Australian Open champion.