sentences:  Zazzo was born in Paris into a modest family.After obtaining a Doctorate of Letters in the Sorbonne (1933-1933), on the advice of Meyerson and of Henri Wallon, he obtained a grant to study in the laboratory of Gesell at Yale University, where he specialized in child psychology.On his return to France, Zazzo began working for the CNRS and integrated the laboratory of Child Psychobiology and the Practical School of the Higher Studies.