Ray Kurzweil is an American author, inventor, futurist, and director of engineering at Google. Aside from futurology, he is involved in fields such as optical character recognition (OCR), text-to-speech synthesis, speech recognition technology, and electronic keyboard instruments. He is the author of several books on health, artificial intelligence (AI), transhumanism, the technological singularity, and futurism. Kurzweil is generally recognized as a public advocate for the futurist and transhumanist movements, due to his stances on life extension technologies, his efforts to forecast future advances in technology, and his interest in the concept of the technological singularity. At the same time, he has attracted significant criticism from scientists and thinkers.