Guillaume Regamey was born in Paris where he became the pupil of Horace Lecoq de Boisbaudran (1802-1897) together with his two brothers Félix (1844-1907) and Frédéric (1849-1925). He participated to the first 'Salon des Refusés', which took place in François Bonvin's (1817-1887) atelier in 1859, where he befriended Corot. He had a short career and died at the early age of 37. A retrospective exhibition of his oeuvre took place at the Ecole des Beaux Arts in 1876.