Pásztor was the first person to represent Hungary at the International Ice Hockey Federation (IIHF) meetings, and served as his country's delegate from 1959 to 1982. He was chosen for the role due to his ability to speak English and German, the dominant languages in Europe at the time. His first international duties were attending the 1959 Ice Hockey World Championships in Prague, on behalf of Hungary. He later began serving as a member of the IIHF medical committee in 1971. From 1982 to 1994, he served in the dual role of being an IIHF executive council member, and as the chairman of the medical committee to oversee doping in sport. When the testing for doping in sport was first introduced, he thought that ice hockey would not be deeply affected, but later said that notion was a mistake. He also served on the board for the IIHF European Champions Cup during this time. During his tenure with the IIHF, Pásztor had been involved in 45 Ice Hockey World Championships, and seven Winter Olympic Games.