Secretan, Marc Francois Louis
Brief Bio: 1804-1867, mathematician; scientific instrument maker, Swiss
until 1844 - professor of mathematics at Academy of Lausanne;
1840 - worked with Friedrich von Martens and Samuel Heer producing daguerreotypes;
1844 - moved to Paris;
1845 - partnership with Lerebours as Lerebours & Secretan; used joint name until 1880s and beyond.
1855 - after retirement of Noel Paymal Lerebours became sole proprietor of Lerebours and Secretan, and signed himself as "Maison Lerebours et Secretan / Secretan, Successeur" and as "Opticien de S.A.M. l'Empereur." He also did work for the Paris observatory.
after 1860 - Secretan also issued catalogs as sole proprietor after 1860
Collaborated with William Eichens, designer of telescopes.
1860s - worked with Foucault, improved silvering techniques.
1867 - succeded by his son, Auguste Secretan (1833-1874) and nephew, Georges Secretan (1837-1906 )
1874 - succeded by his cousin, Georges.
c. 1900 - succeded by Paul Victor Secretan