A veteran of the GT3 scene, Keilwitz's most notable accolades include the 2010 FIA GT3 European Championship and 2013 ADAC GT Masters, as well as being the lap record holder at the Nürburgring 24 Hours.

[1] He has also won the 2017 Blancpain GT Series Sprint Cup in the Pro-Am class.

He went on to triumph in the FIA GT3 European Championship the following year, winning four races at Callaway Competition alongside Christian Hohenadel.

Since 2022, Keilwitz has been driving for Rinaldi Racing in the LMP3 class of the Michelin Le Mans Cup.

Aside from his record lap in 2023, Keilwitz finished second in the SP8 class in 2011 and won the 2023 contest whilst driving in the SP9 Pro-Am category in a Ferrari 296 GT3 fielded by WTM by Rinaldi Racing.