Ian Wilmut, best known for leading the team that cloned Dolly, earned his PhD in 1971 for research that included work that led to the birth of Frosty, the first calf born from a frozen embryo. Now a professor at the Roslin Institute, Edinburgh, Scotland, he will move later this year to the University of Edinburgh. He recently received a license from the UK government to clone human embryos, and on
Ricki Lewis, who writes about nuclear reprogramming in cloning on