SEAOI - Structural Engineers Association of Illinois
- Offers advocacy, support, networking and education for the structural engineering professionals. Includes committees, bylaws, events, political action committee (PAC), links, forums, student outreach, and contacts.
- http://www.seaoi.org/

MSCI - Metals Service Center Institute
- Headquarters for international trade association that serves as the voice of the steel service center industry. Provides information, education, government relations, market development,networking opportunities and a forum for discussion and cooperation.
- http://www.msci.org/