Born this day in 1921, embryologist and genetic engineering pioneer Beatrice Mintz contributed enormously to the understanding of inheritance, growth and cellular differentiation. After a Fulbright research fellowship afforded her studies abroad in Paris and Strasbourg, Mintz came to Philadelphia in 1960 to continue cancer research, perfecting techniques for reprogramming tumour cells, cloning and using viral messengers to introduce foreign DNA. Mintz remains on the faculty of the Fox Chase Cancer Centre.