February 2006 to present, Distinguished Teaching Professor and Chair, Faculty of Environmental and Forest Biology (EFB), SUNY-ESF, Syracuse, NY July 2005 to February 2006, Distinguished Teaching Professor and Interim Chair, Faculty of EFB, SUNY-ESF. June 1998 to June 2005, Distinguished Teaching Professor, Faculty of EFB, SUNY-ESF. August 1995 to June 1998, Professor, Faculty of EFB, SUNY-ESF. August 1989 to July 1995, Associate Professor (with Continuing Appointment), Faculty of EFB, SUNY-ESF. August 1985 to August 1989, Assistant Professor, Faculty of EFB, SUNY-ESF. March to August 1985, Research Associate, Institute of Ecology, University of Georgia, Athens, Georgia. August 1980 to December 1984, Graduate Instructor, Department of Forestry and Natural Resources, Purdue University, West Lafayette, Indiana. August 1978 to August 1980, Research Assistant, Department of Forestry, University of Kentucky, Lexington, Kentucky.