Bruce Alberts received his PhD from Harvard University and is Professor of Biochemistry and Biophysics at the University of California, San Francisco. He is the editor-in-chief of Science magazine. For 12 years he served as President of the U.S. National Academy of Sciences (1993-2005). Dennis Bray received his PhD from Massachusetts Institute of Technology and is currently an active emeritus professor at University of Cambridge. In 2006 he was awarded the Microsoft European Science Award. Karen Hopkin received her PhD in biochemistry from the Albert Einstein College of Medicine and is a science writer in Somerville, Massachusetts. She is a regular columnist for The Scientist and a contributor to Scientific American's daily podcast, "60-Second Science." Alexander Johnson received his PhD from Harvard University and is Professor of Microbiology and Immunology and Director of the Biochemistry, Cell Biology, Genetics, and Developmental Biology Graduate Program at the University of California, San Francisco. Julian Lewis received his DPhil from the University of Oxford and is an Emeritus Scientist at the London Research Institute of Cancer Research UK. Martin Raff received his MD from McGill University and is at the Medical Research Council Laboratory for Molecular Cell Biology and Cell Biology Unit at University College London. Keith Roberts received his PhD from the University of Cambridge and was Deputy Director of the John Innes Centre, Norwich. He is currently Emeritus Professor at the University of East Anglia. Peter Walter received his PhD from The Rockefeller University in New York and is a Professor in the Department of Biochemistry and Biophysics at the University of California, San Francisco, and an Investigator of the Howard Hughes Medical Institute.