2005-present Professor. Departments of Neurology and Microbiology & Immunology, University of Illinois at Chicago (UIC).

1995-2005 Professor. Departments of Neurology and Microbiology-Immunology, Northwestern University Medical School (NUMS), Chicago, IL.

1993-2005 Professor. Department of Biochemistry, Molecular Biology & Cell Biology, Northwestern University and Division of Neurology, Evanston Hospital, Evanston, IL.

1991-1993 Henry P. & Georgette Goldschmidt Professor & Chairman. Department of Neurology, The Mount Sinai School of Medicine, New York, NY.

1989-1991 Professor and Vice-Chair of Neurology. Department of Neurology and Microbiology-Immunology, University of Colorado Health Sciences Center, Denver, CO.

1988-1989 Professor. Department of Microbiology-Immunology, NUMS.

1987-1989 Acting Chair. Department of Neurology, NUMS.

1984-1989 Ernest J. & Hattie H. Magerstadt Professor of Neurology. NUMS.

1978-1981 Associate Professor of Neurology. NUMS.

1972-1977 Assistant Professor of Neurology. NUMS.

1965-1967 US Army Medical Officer. Walter Reed Army Institute of Research, Washington, D.C.

1964-1965 Medicine Internship. Ohio State University Hospitals, Columbus, OH.

2003          Elected AAAS (American Association For The Advancement of Science) Fellow

2001-2003 French Multiple Sclerosis Society (ARSEP), Reviewer of Research Grants

2000-2005 NIH Clinical Neuroimmunology and Brain Tumors Study Section Member

1994-present Ad hoc reviewer Ann Neurol, Amer J Path, J Neuroimmunol, J Virology, Neurology, PNAS, Virology

1994-present Editorial Board, Journal of Neurovirology

1991-1995 Board of Scientific Advisors, Sterling Drug, Upper Township Provence, PA

1990-1996 Editorial Board, Annals of Neurology

1988-1995 NIH Senator Jacob K. Javits Neuroscience Investigator Award

1987-1989 NIH Experimental Virology Study Section

1986-present Consultant CDC, Poliomyelitis Surveillance of Vaccine-related Poliomyelitis

1986-1990 NMSS Advisory Committee on Clinical and Therapeutic Trials

1983-1990 Advisory Board, Archives of Virology

1982-1986 NIH Neurological Disorders Program Review Committee B

1982-1990 NMSS Advisory Committee on Drug Development

1980-1981 Josiah Macy Jr. Foundation Faculty Scholar Award

1977-1982 NIH (NIAID) Research Career Development Award

1973          Board Certified by the American Board of Neurology and Psychiatry

1964          Alpha Omega Alpha

1960-1962 Nebraska Regents Scholarship