Founder of Siem Industries SA, Kristian Siem is a Norwegian businessperson who has been at the helm of 11 different companies and is Chairman at Siem Industries SA, Chairman of Siem Industrikapital AB (a subsidiary of Siem Industries SA), Chairman at Subsea 7 SA, Chairman for Subsea 7 SA (Luxembourg) (a subsidiary of Subsea 7 SA), Chairman at Siem Shipping, Inc., Chairman of Siem Shipping UK Ltd. (a subsidiary of Siem Shipping, Inc.), Chairman for Siem Offshore AS and Chairman of Siem Capital AB. Kristian Siem is also on the board of 7 other companies.

In his past career he was Chairman at Subsea 7, Inc., Chairman at Siem Offshore, Inc. and Chairman at Siem Car Carriers AS.