1937
Born in Dübendorf, Switzerland to Hermann and Mina Zweidler.
1952
Becomes an apprentice at Notariat Zürich-Altstadt Business School.
1960
Enrolls at the Biology Department at the University of Zürich.
1962
Becomes a teacher for biology and chemistry at Kantonsschule Schaffhausen.
1962
Becomes a teaching assistant in the Department of Botany at the University of Zürich and marries Irène Erika Baertschi one year later.
1964
Becomes a research fellow of the Institute for Cancer Research in the Department of Pathology of the University of Zürich.
1964
Receives the Outstanding Student Research Award from the University of Zürich.
1966
Receives a Doctor of Philosophy from the University of Zürich.
1966
Serves as a postdoctoral fellow of the Cell Research Institute at the University of Texas at Austin.
1969
Serves as a visiting scientist at the Institute for Cancer Research in Philadelphia, Pennsylvania.
1970
Becomes a senior research associate in the Department of Botany at the University of Texas at Austin.
1972
Becomes an assistant member of the Institute for Cancer Research.
1976
Becomes an associate member of the Fox Chase Cancer Center in Philadelphia, Pennsylvania.
1980
Becomes a biomedical scientist and educator at the Fox Chase Cancer Center.
1984
Becomes an adjunct associate professor and member of the genetics graduate group at the University of Pennsylvania Medical School.
1985
Becomes director of the Fox Chase Protein Chemistry Facility.
1986
Undergoes triple bypass surgery at Temple University Hospital.
1990
Publishes research on protein foot printing method.
1992
Establishes MALDI-TOF Facility at Fox Chace Cancer Center.
1996
Retires and moves to Florida.