| 1986 - present | Owner / President |
| McKnight Laboratory, Inc. | |
| Santa Fe Springs, CA | |
| 1979 - 1986 | Partner / Owner (50%) |
| Mettek | |
| Santa Ana, CA | |
| 1975 - 1979 | Owner |
| Materials Science Center | |
| Newport Beach, CA | |
| 1967 - 1975 | Chief Metallurgist |
| Testing Engineers | |
| Los Angeles and San Diego, CA offices | |
| 1960 - 1967 | Research Laboratory Engineer |
| Eagle Pitcher Corporation | |
| Chicago Vitreous Division | |
| Chicago, IL | |
| 1959 - 1960 | Research Engineer |
| Boeing Airplane Company | |
| Seattle, WA | |
| 1957 - 1959 | Metallurgical and Corrosion Engineering Work |
| Corps of Engineers | |
| Anchorage, AK |