Career history of John R. Callahan
Former positions of John R. Callahan
| Companies | Position | Start | End |
|---|---|---|---|
| Globalcast Communications, Inc. | Director/Board Member | 01/01/1995 | 01/01/1998 |
Xerox Corp.
 Xerox Corp. Computer PeripheralsElectronic Technology Xerox Corp. engages in the integration of paper and digital products. The firm offers home, office, office laser, multifunction and all in one printer, digital sheet-fed printing presses and scanner. The company was founded in 1906 and is headquartered in Norwalk, CT. | Corporate Officer/Principal | 01/01/1985 | 01/01/1988 |
| IBM | Corporate Officer/Principal | 01/01/1981 | - |
| US Air Force | Corporate Officer/Principal | 01/01/1982 | - |
Quantum Solutions LLC
 Quantum Solutions LLC Information Technology ServicesTechnology Services Quantum Solutions LLC provides network design and information technology consulting services. The firm provides both consulting and technical support to individual and business clients. The company was founded in 1985 and is headquartered in Owings Mills, MD. | Corporate Officer/Principal | - | - |
Statistics
International
| United States | 6 |
Operational
| Corporate Officer/Principal | 4 |
| Director/Board Member | 1 |
Sectoral
| Technology Services | 4 |
| Electronic Technology | 2 |
| Government | 2 |
Positions held
Active
Inactive
Listed companies
Private companies
Linked companies
| Listed companies | 1 |
|---|---|
| IBM | Technology Services |
| Private companies | 4 |
|---|---|
Quantum Solutions LLC
Quantum Solutions LLC Information Technology ServicesTechnology Services Quantum Solutions LLC provides network design and information technology consulting services. The firm provides both consulting and technical support to individual and business clients. The company was founded in 1985 and is headquartered in Owings Mills, MD. | Technology Services |
Xerox Corp.
Xerox Corp. Computer PeripheralsElectronic Technology Xerox Corp. engages in the integration of paper and digital products. The firm offers home, office, office laser, multifunction and all in one printer, digital sheet-fed printing presses and scanner. The company was founded in 1906 and is headquartered in Norwalk, CT. | Electronic Technology |
| Globalcast Communications, Inc. | Technology Services |
| US Air Force | Government |
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