Boris Alexandrovich Krylov, born in 1926, is a doctor of engineering, professor, and academician of the Academy of Architectural and Building Sciences of Russia, of the Russian Engineering Academy, and of the International Academy of Informatization. Dr. Krylov is an expert in the field of construction under extreme conditions, including Arctic and permafrost regions and regions with dry, hot climate, and in problems relating to acceleration of concrete hardening rate at precast concrete factories and at building sites. He is the author of more than 300 publications, inventions and patents. Dr. Krylov represented the U. S. S. R. at the Reunion Internationale des laboratoires d'essais et de recherches sur les materiaux et les constructions (RILEM) for many years, heading the Technical Committee on Winter Concreting (39-BH) in this organization. He presently is Deputy Director for Research of the Research Institute of Concrete and Reinforced Concrete in Moscow and a professor at Moscow State University of Construction.