Professor Massalski in 1970 contributed a seminal paper ( T.B. Massalski, “Massive Transformation”, Phase Transformations, ASM,Metals Park,OH, p.433,1970) identifying a distinct mode of solid state transformation defined as a compositionally invariant, diffusional nucleation and growth process involving a change in crystal structure and/or degree of order; the transformation is propagated by the migration of disordered or incoherent interphase interfaces across which no systematic crystallographic orientation relationship necessarily exists between the parent and product phases. This 1970 review critically assessed previous work dating back to the 1930s and included careful analysis of his own investigations. After previous symposia it became clear that based on the experimental evidence the basic ideas promulgated by Professor Massalski regarding the essential nature of the massive transformation were relevant to a wide variety of metallic and ceramic systems. This talk will highlight this scientific journey based on the contributions of numerous investigators since 1970.