Danish UC submarines were built by the entrepreneur who is CEO of what company?
Peter Madsen (inventor) Peter Langkjær Madsen (] ; born 12 January 1971) is a Danish aerospace engineering enthusiast, "art engineer", submarine builder, entrepreneur, co-founder of the non-profit organization Copenhagen Suborbitals, and founder and CEO of RML Spacelab ApS.
Jeffery Hildebrand Jeffery Hildebrand (born 1959) is an American businessman, who is the founder, chairman, and chief executive officer (CEO) of Hilcorp Energy Company.