| 2009 - Now | 
				Professor of Mathematics | 
				Siena College | 
						
				| 1996 - 2002 | 
				Adjunct Associate Professor of Mathematics | 
				Rensselaer Polytechnic Institute | 
						
				| 1994 - 2009 | 
				Associate Professor of Mathematics | 
				Siena College | 
						
				| 1991 - 1992 | 
				Summer Instructor of Mathematics | 
				Union College | 
						
				| 1990 - 1994 | 
				Assistant Professor of	Mathematics | 
				Siena College | 
						
				| 1989 - 1990 | 
				Assistant Professor of Mathematics | 
				Wilkes University | 
						
				| 1988 - 1989 | 
				Assistant Professor of Mathematics | 
				Wilkes College | 
						
				| 1985 - 1988 | 
				Instructor, Mathematics | 
				Wilkes College | 
						
				| 1981 - 1985 | 
				Lecturer, Mathematics | 
				SUNY Buffalo | 
						
				| 1979 - 1979 | 
				Summer Instructor of Logic | 
				Skidmore College | 
						
				| 1979 - 1981 | 
				Teaching Assistant, Mathematics | 
				SUNY Buffalo | 
						
				| 1977 - 1978 | 
				Head Resident | 
				Harcum Junior College | 
						
				| 1977 - 1979 | 
				Substitute Teacher and Tutor of Mathematics | 
				Baldwin School | 
						
				| 1975 - 1977 | 
				Dean of Girls | 
				Buxton School | 
						
				| 1974 - 1977 | 
				Teacher of Mathematics | 
				Buxton School | 
						
				| 1973 - 1974 | 
				Teaching assistant of logic | 
				Arizona State University |