2005-present University Professor of Psychology, an d Special Assistant for Curriculum Development and Research Initiatives, Yeshiva Un iversity, Office of the Provost 1995-2005 Dean, Yeshiva College 1995-2005 Professor of Psychology, Yeshiva University 1993-1995 Vice Provost for Research and Gradua te Education, Northeastern University 1993-1995 Professor of Psychology, Northeastern University 1989-1993 Associate Dean for the College, School of Arts and Sciences, University of Pennsylvania 1988-1993 Professor of Psychology in Psychiatry, Sch ool of Medicine, University of Pennsylvania 1985-1993 Research Professor, Department of El ectrical Engineering, Drexel University 1985-1993 Member, Graduate Group in Anatomy, University of Pennsylvania 1983-1993 Member, Graduate Group in Neuroscience, University of Pennsylvania 1978-1985 Executive Committee, Inst. of Neurological Sciences, University of Pennsylvania 1982-1993 Director, Delaware Valley Faculty Exchange Program in the Biological Basis of Behavior 1978-1989 Founder and Chairman, Biological Basis of Behavior Program, University of Pennsylvania 1970-1993 Member, Inst. of Neurological Sciences, University of Pennsylvania 1969-1993 Member, Graduate Group in Biology, University of Pennsylvania 1980 Visiting Professor, Swarthmore College 1977 Visiting Professor, Psychology Dept., University of Texas 1976-1993 Professor, Department of Psychology, University of Pennsylvania 1975 Visiting Scientist, Dept. of Zoology, University of Edinburgh, Edinburgh, Scotland 1971-76 Associate Professor, Dept. of Psychology, University of Pennsylvania 1968-71 Assistant Professor, Dept. of Psychology, University of Pennsylvania