Peter Madsen is an Artist

Artist

An artist is a person engaged in one or more of any of a broad spectrum of activities related to creating art, practicing the arts and/or demonstrating an art. The common usage in both everyday speech and academic discourse is a practitioner in the visual arts only...

, Aerospace engineer, Entrepreneur

Entrepreneur

An entrepreneur is an owner or manager of a business enterprise who makes money through risk and initiative.The term was originally a loanword from French and was first defined by the Irish-French economist Richard Cantillon. Entrepreneur in English is a term applied to a person who is willing to...

 and founder of Copenhagen Suborbitals

Copenhagen Suborbitals

Copenhagen Suborbitals is a non-profit organization working towards suborbital manned spaceflight. Founded in 2008 by Kristian von Bengtson and Peter Madsen the project has accomplished a successful sea launch of a test hybrid rocket, carrying a full scale human model...

; a private spaceflight company.

Work on UC3 Nautilus

Madsen worked on the UC3 Nautilus

UC3 Nautilus

UC3 Nautilus is a privately-built Danish submarine. It was launched on 3 May 2008 in Copenhagen, Denmark. It was built over a three year period as an art/hobby project by Peter Madsen and a group of volunteers, and cost approximately US$200,000 to build .This submarine was Peter Madsen's third...

, a privately-built Danish submarine

Submarine

A submarine is a watercraft capable of independent operation below the surface of the water. It differs from a submersible, which has more limited underwater capability...

. It was launched on 3 May 2008 in Copenhagen

Copenhagen

Copenhagen is the capital and largest city of Denmark, with an urban population of 1,199,224 and a metropolitan population of 1,930,260 . With the completion of the transnational Øresund Bridge in 2000, Copenhagen has become the centre of the increasingly integrating Øresund Region...

, Denmark

Denmark

Denmark is a Scandinavian country in Northern Europe. The countries of Denmark and Greenland, as well as the Faroe Islands, constitute the Kingdom of Denmark . It is the southernmost of the Nordic countries, southwest of Sweden and south of Norway, and bordered to the south by Germany. Denmark...

. It was constructed over a three year period and it cost cost approximately US$200,000 to build (1.5 million in DKK

Danish krone

The krone is the official currency of the Kingdom of Denmark consisting of Denmark, the Faroe Islands and Greenland. It is subdivided into 100 øre...

).

Work on Copenhagen Suborbitals

On May 1, 2008, Peter Madsen along with Kristian von Bengtson

Kristian von Bengtson

Kristian von Bengtson is a Danish architect, specializing in manned spaceflight, a resident of Copenhagen and married with animation director Karla von Bengtson...

 founded Copenhagen Suborbitals

Copenhagen Suborbitals

Copenhagen Suborbitals is a non-profit organization working towards suborbital manned spaceflight. Founded in 2008 by Kristian von Bengtson and Peter Madsen the project has accomplished a successful sea launch of a test hybrid rocket, carrying a full scale human model...

. Peter Madsen is responsible for the rocket engines.