Gunter was born on February 2, 1970 in Olfen, Nordrhein-Westfalen, Germany. His height is 6'1", and weighs between 285 to 320 pounds. His eye color is blue; and hair color is blond. He his nicknamed the 'Gentle Giant'.
Religion is Catholic. He has two older brothers, one younger sister. Grew up on a farm. Married to Carmen Jourst. Had a 1997 Endorsement contract with Univeral Nutrition. His current measurements are 58" chest, 23" arms.
Contests include the 1988 Newcomer Competition Jr. HW 1st & overall; 1990 Junior German Championships - overall; 1990 Junior World Championships - overall;1992 Men's German Championships - overall; 1992 Men's European Championships - overall; 1993 Men's World Championships - overall; 1994 Mr. Olympia 16th; 1994 Grand Prix Germany 8th; 1994 Grand Prix England 9th; 1995 Grand Prix Ukraine 10th; 1995 Canada Pro 2nd; 1996 Arnold Classic 11th; 1996 San Jose Pro 9th; 1996 Night of Champions 11th; 1997 Ironman Pro 11th (disqualified); 1997 San Jose Pro 11th; 1997 Canada Pro 6th; 1997 Night of Champions 9th; 1998 San Francisco Pro 9th; 1998 Toronto Pro 6th; 1998 Night of Champions 10th; 1998 Mr. Olympia 15th; 1998 Grand Prix Germany 6th; 1998 Grand Prix Finland 6th; 1999 Ironman 5th; 1999 Arnold 9th;