Ian Wilmut was part of the team responsible for producing a calf from an embryo that had been frozen. The animal was named "Frosty" because of its unique start in life. Frosty was born in 1973, but Wilmut really became front page news when Dolly the Sheep came along, and was announced to the world in February of 1997. Since that time the press has hardly stayed away from him and he has become one of the most famous scientists in genetics.
Wilmut and his team had successfully created a sheep that was a genetic replica of its mother. The sheep, named Dolly after country singer Dolly Parton, was created with an ovum and a mammary cell from the parent sheep. When the news broke, the public was fascinated and appalled, probably in equal measure, and Dolly's birth gave rise to concerns that scientists were attempting to clone humans. Wilmut has stated that he is opposed to this idea, and so far there isn't any proof that any scientist anywhere in the world has cloned a human. It remains in the realm of science fiction.