Legacy of Profs. Octave Levenspiel and Daizo Kunii lives on with much of the Reaction Engineering and Particulate/ Fluo-solids Systems design work at DIFREX. Prof. Levenspiel’s two pioneering books one on Chemical Reaction Engineering and the other on Fluidization Engineering coauthored with Prof. Daizo Kunii are the foundations of our NEXGEN Reactor Design and Development work for the industry.