Wessig, a professional chef, trained with the SC Traktor Schwerin under trainer Bernd Jahn. He attended the John Brinckmann School in Goldberg. Wessig was 2.01 metres tall and, while he was competing, weighed 88 kilograms. Shortly before the 1980 Olympics, he surprisingly became East German champion, setting a new personal best result of 2.30 metres and was subsequently nominated for the East German Olympic team.
1980 Olympics
At the 1980 Olympic Games in Moscow, the 21-year-old was thus amongst the mild favourites, but the heavy favorite was the defending champion, Jacek Wszoła, of Poland: at the 1976 Olympics in Montreal, Wszola had established a new Olympic record of 2.25 metres. Early in the 1980 outdoor season, Wszola set a new world record of 2.35 on Sunday 25 May, and this mark was tied the next day by 18-year-old West GermanDietmar Mögenburg, at a competition in Rehlingen, Germany. Because of the western nations' boycott of the Moscow Olympics, Mögenburg did not compete. Of the 16 finalists in the men's high jump, thirteen used the Fosbury Flop style, and three used the classic straddle. Wessig not only out-dueled Wszoła for the gold during the finals on 1 August, the two shattered the 1976 mark several times, with clearances at 2.27, 2.29, and 2.31. Wessig began the competition at 2.15, and was flawless until 2.29, when he needed two attempts. That proved to be the decisive height: of the 7 men who cleared 2.27, only 4 managed to scale 2.29. Those four, the Polish champion versus the entire East German team of Wessig, 18-year-old sensation Jörg Freimuth, and 22-year-old Henry Lauterbach, would now battle for the medals. With the other three men having all cleared 2.29 on their first attempts, Wessig's first miss at that height dropped him to fourth place, out of the medals. But, he leaped back into first place, all alone, with his first attempt clearance of 2.31. Wessig then out-jumped the Pole at 2.33 to secure the gold medal. Wessig cleared on his second attempt, the Pole just barely brushing the bar off on his third attempt. Wessig continued to jump, alone, setting a new world record with his jump of 2.36 metres. He set the new record on his second attempt, with a sensational clearance. Wessig, having taken 11 jumps during the competition through 2.36, then took three attempts at 2.38. He thereby became the first high jumper who had managed to improve on the Mens High Jump world record at the Olympic Games. The previous world record holder, Jacek Wszoła from Poland, won the silver medal. Wessig's effort in Moscow was the acme of his career: his world record would stand for three years, and his Olympic record was broken at the 1988 games in Seoul.
Later life
After the Olympic Games, Wessig tried his luck as a decathlete. He turned back to the high jump following frequent injuries. In 1985, he came in second at the World Cup. In 1986, he reached seventh place at the European Championships. He became East German champion again 1988 and 1989. Since the end of his active athletics career, he has been running an enterprise in Lübstorf-Rugensee, Mecklenburg-Vorpommern which sells sport equipment, sport and leisure systems, as well as park and garden systems. He married the long jumperChristine Schima.