Pierre Guénégan is an expert in modern paintings and drawings (1870–1970). Specializing in a number of painters, notably Serge Charchoune, Amédée Ozenfant and the Purist movement, he can be consulted for artwork appraisals and to issue certificates of authenticity. Recognized by cultural institutions, auction houses, and collectors, he regularly publishes texts for exhibitions. Pierre Guénégan also publishes annoted catalogs on the artists in which he is an expert.