Sir Gregory Paul "Greg" Winter (born 14 April 1951) is a British biochemist, a pioneer of therapeutic monoclonal antibodies. He invented techniques to both humanise (1986) and, later, to fully humanise using phage display, antibodies for therapeutic uses.Previously, antibodies had been derived from mice, which made them difficult to use in human therapeutics because the human immune system had anti-mouse reactions to them.In 2012 he received the Princess of Asturias Award for Technical and Scientific Research.