Exhibit 21
Subsidiaries of the Registrant
The following are subsidiaries of the Registrant as of December 31, 2006 and the jurisdiction in which each is organized. Each of the subsidiaries generally conducts its business using names indicated, with the exception noted below. Certain subsidiaries are not listed; these omitted subsidiaries individually and in aggregate do not constitute a significant subsidiary.
Subsidiaries of Registrant | State or Country of Organization | |
| Transportation Construction Services, Inc. | Delaware | |
| Hill International (Puerto Rico), Inc. | Delaware | |
| Stanley Baker Hill, LLC (a)(c) | Delaware | |
Subsidiary of Transportation Construction Services, Inc. | ||
| Hill International S.A. | Luxembourg | |
Subsidiaries of Hill International S.A. | ||
| Hill International (Anatolia) | Turkey | |
| SIA Hill International (Baltic) | Latvia | |
| Hill International Services Ltd. | British Virgin Islands | |
| Hill International (UK) Ltd. | England | |
| Hill International (Bucharest) S.R.L. | Romania | |
| Hill International (Hellas) S.A. | Greece | |
| Hill International (Middle East) Ltd. (b) | British Virgin Islands | |
| Hill Construction Management Ltd. | Serbia | |
| Hill International Rijeka d.o.o. | Croatia | |
| James R. Knowles (Holdings) Ltd. | England | |
Subsidiary of Hill International (UK) Ltd. | ||
| Pickavance Group Ltd. (c) | England | |
Subsidiaries of James R. Knowles (Holdings) Ltd. | ||
| James R. Knowles Global Ltd. (c) | England | |
| James R. Knowles (Worldwide) Ltd. (c) | England | |
| James R. Knowles (Australian Holdings) Pty. Ltd. (c) | Australia | |
| Knowles North American Holdings Inc. (c) | Canada | |
| Knowles Consultancy Services, Inc. | Canada | |
| (a) | Limited liability company |
| (b) | Does business in Kuwait, Bahrain, UAE and Qatar |
| (c) | Parent corporation of additional subsidiaries |