Ralf Kelleners is from Dinslaken, Germany. His father was a European touring car driver and they share the same helmet design.
Kelleners offers a strong endurance driving style, – "I'm a safe driver. I can go quick without being hard on the chassis or taking risks. I can go a good race speed without causing any trouble."
"A race-car driver has to have a very big ego to be successful. But in sports-car racing, it's different. You have to work with your co-drivers. You may be the quicker driver, but if you don’t work with your teammate, your car may not win."
- 2003 Rolex 24 at Daytona – second overall, second GT, Ferrari 360 Modena GT; American Le Mans Series GT, Ferrari 360 Modena GT
- 2002 Won Rolex 24 at Daytona SRPII, third overall, fastest SRPII test time, Rolex Sports Car Series – three wins, one pole, six podiums, Nissan Lola; American Le Mans Series GT – two podiums in two starts, Ferrari 360 Modena GT
- 2001 Rolex 24 at Daytona – fastest qualifying time, Ferrari 333 SP; 24 Hours of Le Mans and 12 Hours of Sebring, Audi R8
- 2000 24 Hours of Le Mans, ROC Reynard LMP675; Grand American Road Racing Association, Ferrari 333 SP; ISRS – won Kyalami, Kremer
- 1999 Porsche Supercup – three wins; 24 Hours of Le Mans, Toyota GT-One
- 1998 class wins, Watkins Glen and Petit Le Mans, Porsche; Rolex 24 at Daytona, Porsche; 24 Hours of Le Mans, Toyota GT-One
- 1997 won Rolex 24 at Daytona GT2, fourth overall, Porsche 911; FIA GT World Championship and 24 Hours of Le Mans, Porsche GT1
- 1996 Won 24 Hours of Le Mans GT2; won GT1 in Zhuhai, China, Porsche; BPR GT2 – three wins; champion, German Carrera Cup – two wins; champion, Porsche Supercup – two wins
- 1995 Second, German GT Cup, Porsche 911 GT2
- 1994 champion, ADAC GT Cup, three wins, Porsche Carrera RSR; champion, New Zealand Nissan-Mobil 500 Series, two wins
- 1993 German GT Cup, Ford Escort Cosworth
- 1992 Second, German Group N touring class, two wins
- 1991 DTM, BMW
- 1990 German Group N touring class – two wins
- 1988 - 90 Formula Three;
- 1987 German Formula Ford 2000, two wins;
- 1986 European go-kart championship; champion.