Born in Dübendorf, Switzerland to Hermann and Mina Zweidler.
Becomes an apprentice at Notariat Zürich-Altstadt Business School.
Enrolls at the Biology Department at the University of Zürich.
Becomes a teacher for biology and chemistry at Kantonsschule Schaffhausen.
Becomes a teaching assistant in the Department of Botany at the University of Zürich and marries Irène Erika Baertschi one year later.
Becomes a research fellow of the Institute for Cancer Research in the Department of Pathology of the University of Zürich.
Receives the Outstanding Student Research Award from the University of Zürich.
Receives a Doctor of Philosophy from the University of Zürich.
Serves as a postdoctoral fellow of the Cell Research Institute at the University of Texas at Austin.
Serves as a visiting scientist at the Institute for Cancer Research in Philadelphia, Pennsylvania.
Becomes a senior research associate in the Department of Botany at the University of Texas at Austin.
Becomes an assistant member of the Institute for Cancer Research.
Becomes an associate member of the Fox Chase Cancer Center in Philadelphia, Pennsylvania.
Becomes a biomedical scientist and educator at the Fox Chase Cancer Center.
Becomes an adjunct associate professor and member of the genetics graduate group at the University of Pennsylvania Medical School.
Becomes director of the Fox Chase Protein Chemistry Facility.
Undergoes triple bypass surgery at Temple University Hospital.
Publishes research on protein foot printing method.
Establishes MALDI-TOF Facility at Fox Chace Cancer Center.
Retires and moves to Florida.