http://www.sdg.com
This well-known firm consults on the corporate implementation of decision analysis and real options. Gardner Walkup, Partner, heads the real options practice area.

http://www.adainc.com/
ADA is a pioneer in the corporate application of decision analysis and real options. The firm is now a business unit of Standard & Poors.

http://www.decisionoptions.com/
Decision Options is headed by Gill Eapan, and brings pharmaceutical industry experience to the application of several analytical approaches, including real options.

http://www.rogroup.com/
This is the consulting firm headed by Lenos Trigeorgis. It has a European, African and US presence.

http://www.mcfonline.com/mcf/client/real.php
Monitor Consulting offerings real options assistance through their corporate finance group. The practice area is headed by Tom Copeland, author of well-known books on valuation and real options.