Alongside his brother, Paul, Théophile Zech–Levie was a director of the printer and publishing house Zech et Fils previously known as the Imprimerie Lelong. The publishing house, created in 1785, specialized in religious and scientific works which were exported across Europe. The Zech family took control of the publishing house in 1883. Théophile was a co–founder of the Syndicat des Editeurs Belges in 1935 (now the Association des Editeurs Belges: ADEB) alongside Ernest Vandevelde (see Emile Bruylant above).