Oscar Wallace Greenberg is a physicist and professor at University of Maryland, College Park.
- 1956 Instructor at Brandeis University.
- 1957 Air Force Cambridge Research Center , 1st Lieutenant, USAF.
- 1959 NSF postdoctoral fellow at MIT.
- 1961 Assistant professor at University of Maryland.
- 1963 Associate professor at University of Maryland.
- 1964 Proposed the existence of color charge.
- 1967 Professor at University of Maryland.