Sergei Kravchenko (1959) — Russian psychologist, founder of temporal psychology. He started his practice in a technical school, where he was dealing with problematic teenagers. His research on changes in consciousness, research on loneliness, internal dialogue, time, premonition, personality face and its masks spans over 30 years. His research aims to cope with personality disorders. Based on his professional experience he wrote several books, in which he discusses the ways of understanding the «ego» of an individual and of development of unique personal capabilities. He acknowledges that people without psychological face do exist.