The history of phage research as the origin of molecular biology is re
lated as seen by a scientist located at that critical time in Geneva.
The preponderant influence of Max Delbruck on these developments is tr
aced as a consequence of his personal charisma. Jean Weigle, former pr
ofessor of experimental physics in Geneva and later research fellow wi
th Delbruck, acted as an important ambassador to the European groups.