I report why and how I became engaged in the study of organic semiconductors. My first step ( 1947) in the investigation of organic semiconductors was the measurement of electrical resistance of powdered graphite and carbon materials. Through this observation I accepted the property that carbon particles certainly conduct electric current. I noticed that functional groups bound to the edges of polycyclics in graphite do not cause swelling. I hit upon an idea that polycyclic aromatic compounds with molecular structures similar to fragments of graphite might be electrically conductive. Then, I started measuring the electrical resistance of violanthrone and hence found semiconductive behavior in organic solids ( 1954).