System Change's consulting clients have included:
- Zend Technologies
- Simplicity Orthopedic Solutions
- Tessera Technologies
- Visible Systems
- Raytheon
- Cybersensor
- Genuity
- TCI
- Contec, LP
- Bucknell University
- Ticonderoga Capital
- Others
John Carlson, the company's Founder, has held the following management positions:
- Founder and CEO of System Change
- Acting COO and CFO at Tessera Technologies
- Program Manager for multi-company cable systems upgrade program implemented by TCI and Contec, LP
- President and COO at Learning Services Corporation, promoted from CFO
- CFO and VP Finance at Algorex Corporation
- Global Division VP Finance and Controller of Power Semiconductor Division at General Instrument