He won the silver medal at the 1991 European Championships, in 68.0 kg. Freestyle.[1]
At the 1992 European Championships, in 68.0 kg. Freestyle, Geller came in 7th.[1]
Geller competed for Israel at the 1992 Summer Olympics, in Barcelona, at the age of 21, in Wrestling—Men's Lightweight, Freestyle.[1] He defeated Jesús Eugenio Rodríguez of Cuba, lost to Fatih Özbaş of Turkey, and then faced Endre Elekes of Romania and both wrestlers were disqualified for passivity.[1] When he competed in the Olympics, he was 5-7.5 (172 cm) tall, and weighed 157 lbs (71 kg).[1][2] He finished in 11th place.[2]
At the 1994 World Championships, in 68.0 kg. Freestyle, Geller came in 11th.[1] At the 1994 European Championships, in 68.0 kg. Freestyle he also came in 11th.[1]