Starting from her own personal experience, in the First Part of the article, the author reconstructs how the specialized sectors of cognitive evaluation and rehabilitation evolved in Western countries (Europe, the United States, Canada, and Australia, in particular) during the second half of the last century and the first decades of this century. In the Second Part, she describes her personal experience in setting up a rehabilitation centre dedicated to traumatic brain‐injured subjects and her commitment to international cooperation (Bolivia, Rwanda, Myanmar, Tanzania) in the field of cognitive evaluation and rehabilitation in favour of people with congenital and acquired cerebral pathology, especially in the paediatric age, since there is an almost total lack of diagnostic, but above all, rehabilitative procedures for cognitive functions in low‐middle income countries. In the Third Part of the article, the author carries out an extensive review of the international literature on the differences in access to cognitive diagnostic evaluation and cognitive rehabilitation in middle‐ and low‐income countries – but not only – underlining the urgent need to launch a major international collaborative effort to reduce and eliminate these discrepancies.