Henri Chrétien

Henri Jacques Chrétien (French pronunciation: [ɑ̃ʁi ʒak kʁetjɛ̃]; 1 February 1879, Paris – 6 February 1956, Washington, D.C.)^[1] was a French astronomer and an inventor.

Born(1879-02-01)1 February 1879

Paris, France

Died6 February 1956(1956-02-06) (aged 77)

Washington, D.C.

KnownforRitchey–Chrétien telescope

FieldsAstronomy

Quick facts Born, Died ...

Henri Jacques Chrétien
Chrétien at the Fourth Conference International Union for Cooperation in Solar Research at Mount Wilson Observatory, 1910
Born	(1879-02-01)1 February 1879 Paris, France
Died	6 February 1956(1956-02-06) (aged 77) Washington, D.C.
Known for	Ritchey–Chrétien telescope
Scientific career
Fields	Astronomy
Institutions	Nice Observatory École supérieure d'optique

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Born in Paris, France, his most famous inventions are:

• the anamorphic widescreen process, using an anamorphic lens system called Hypergonar, that resulted in the CinemaScope widescreen technique, and
• the co-invention, with George Willis Ritchey, of the Ritchey–Chrétien telescope, an improved type of astronomical telescope, employing a system now used in virtually all large research telescopes.

He spent part of his early astronomical career at the Nice Observatory, which was close to his house, the Villa Paradou. The Villa was built by famous French architect Charles Garnier^{[2][citation needed]} who also built the Nice Observatory and both the operas of Paris and Monaco. In 1995, the abandoned villa was acquired by the artist Rainer Maria Latzke, who restored it and added new murals to the existing frescoes.

Chrétien was one of the founders of the Institut d'optique théorique et appliquée and professor at the French "grande école" SupOptique (École supérieure d'optique).