"All chapters of the collection pay tribute to L. Esakia's outstanding technical work, which inspired greatly several researchers, not only in Georgia but also all over the world, to carry out extensive and deep investigations on modal and intuitionistic logics. For this reason, the volume under review is necessary reading for anyone interested in Esakia's contributions, as well as the current state of the large area in which he conducted his research." (Costas Dimitracopoulos, Metascience, Vol. 24, 2015) "This is a good book on algebras and set theories of intuitionistic and modal logics. ... This a very good book for logicians and mathematics scholars." (Joseph J. Grenier, Amazon.com, June, 2014)