Sergey Andreyev worked in the Computer Center of the Russian Academy of Sciences. He started on systems for applied optimization, and then he found that he was fascinated by sonogram images. He received a PhD for the design of new algorithms and programming systems for speech analysis. He likes to implement new ideas in new areas and he has designed complicated systems for telecommunications, thermodynamics, and analysis of big electricity networks. He has also worked on applications for foreign language studies and for organizing photo archives. Photography is one of his hobbies.