Apprentice at Edmond Lachenal in 1890, he created his own studio at Fontenay-aux-Roses (Seine) in 1907. He makes vases from sandstone and porcelain with engraved and/or painted motifs that represent spirals, roses or geometric designs.
Emile Decoeur is on of the most accomplished potters from France between 1910 and the 1930's.
After the first world war, he worked in Paris. Exuberantly rejecting art nouveau and oriental style designs, he preferred very simply forms and pure lines heightened by a monochromatic glazing. This slight change of course accompagnies his satin or matte glazes.

In the middle of the 1920's, he created many beautiful pieces : vases, cups and bowls which sometimes were inspirational of Chinese forms. These objects were covered in glazes of diverse colors: green, yellow, pink, purple and blue. It had a subtle and sublime effect.

He worked in manufacturing in Sèvres where he stayed as an advisor until 1948.