 In the years 1990-2011 he directed the Intermedia Department at the Academy of Fine Arts, Prague.He was a visiting professor at the Academies in Aix-en-Provence, Carrara, Ljubljana, Reykjavík, Stuttgart, The Hague and Vienna.Šejn works in the fields of visual art, performance and study of visual perception, and conducts workshops, such as Bohemiae Rosa.