where did the a Swiss astronomer work most of his life, who proposed  a class of hypothetical redshift mechanisms that was proposed as an alternative explanation for the redshift-distance relationship?
Tired light: Tired light is a class of hypothetical redshift mechanisms that was proposed as an alternative explanation for the redshift-distance relationship. Fritz Zwicky:  He worked most of his life at the California Institute of Technology in the United States of America, where he made many important contributions in theoretical and observational astronomy.
California Institute of Technology