Dr. Titia de Lange is the Leon Hess Professor, an American Cancer Society Research Professor, and the Director of the Anderson Center for Cancer Research at Rockefeller University. After getting her doctorate from the University of Amsterdam, she pursued her postdoctoral training with Dr. Harold Varmus at UCSF. Here, she isolated human telomeric DNA and was the first to show that tumor telomeres are shortened. She joined Rockefeller University as a Professor in 1990. At Rockefeller, her laboratory studies the mechanisms by which mammalian telomeres are protected from the DNA damage response.