Adobe Systems | BAE Systems | Cisco Systems | Catalog numbering systems for single records | Electronic Data Systems | Cadence Design Systems | Microelectromechanical systems | Marconi Electronic Systems | systems engineering | Space and Missile Systems Center | Raytheon Space and Airborne Systems | Epic Systems | Elbit Systems | Burroughs large systems | Westinghouse Rail Systems | Systems engineering | Nielsen Broadcast Data Systems | Naval Sea Systems Command | Mouse Systems | International Institute for Applied Systems Analysis | BEA Systems | Advanced Systems Format | Systems art | Rafael Advanced Defense Systems | Pinnacle Systems | Perot Systems | Origin Systems | Open Systems Interconnection | Naval Air Systems Command | International Foundation for Electoral Systems |
After leaving government service in 1992, Welch served on the Board of Directors of a number of corporations, including MBDA-US, Verint Systems, Serco Group, Dynacs Military & Defense, Meggitt, and Wilcoxon Research.