As a consultant, Terry Iorns has worked with the following clients:
 | Bristol-Myers Squibb |
| Searle |
| Sandoz |
| Rhone Poulenc |
| Janssen Pharmaceutica |
| Astra Merck |
| Fisons Pharmaceuticals |
| Hoffmann LaRoche |
| TorPharm |
| Engelhard Chemicals |
| Johnson & Johnson |
| Hewlett-Packard |
| Ciba-Geigy |
| Meritus Consulting |