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1942-46
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Assistant. Department of Soil Microbiology. Rutgers University College of Agriculture, and the New Jersey State Agricultural Experiment Station
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1946-47
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Biochemist. New York State Department of Health. Division of Laboratories and Research
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1947-48
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Microbiologist. Sloan-Kettering Institute for Cancer Research
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1949-52
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Assistant Professor of Biology. Brooklyn College
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1952-58
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Director of Research and Professor of Microbiology. National Agricultural College
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1958-62
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Research Biochemist, Department of Pathology, and Microbiologist, Dental Research Laboratory. Passaic General Hospital
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1960-62
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Chief, Division of Microbiology, Department of Clinical Pathology, and Associate in Pathology on the Medical Staff. Philadelphia General Hospital
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1960-62
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Associate. Department of Internal Medicine. University of Pennsylvania Graduate School of Medicine
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1962-65
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Professor. University of Chile
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1965-69
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Professor. Graduate Institute of Education. Washington University
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1966-72
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Microbiologist. Soil Research Project. Ministry of Agriculture. Chile
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1967-69
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Visiting Professor of Science. Webster College
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1968-69
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Adjunct Professor of Earth Sciences. Department of Geology. Washington University
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1969-80
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Professor and Member of the Graduate Faculty, Temple University. College of Education
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1970-76
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Adjunct Professor. Union Graduate School. Union for Experimental Colleges and Universities
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1973-80
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President. Susan B. Anthony University
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1980-81
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Senior Professor. Temple University
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