It would be helpful for me more to know about the biography of A.B.
Zalkind/Salkind (Арон Борисович Залкинд) was a Russian psychiatrist. He was a follower of Freud's psychoanalysis, undoubtedly influential with his ideas in the first 15 years after Soviet Revolution 1917 (for instance concerning sex abstinence in order to collect energies for socialism). But his fate under Stalin's dictatorship is unknown, also the causes of his death. Salkind wrote 1925 (2001 new edited) a book about "pedology", the Russian child-centered variation of "progressive education" in the early years of Soviet Union, the book is well-known in WorldCat but didn't get much attention in the Western World, there exists, as far as I know, no translation in English or another European language. A short Wikipedia-entry about Zalkind gives some information. Perhaps colleagues can help who know more. Especially I am interested in Zalkind's relation to the leading educationalists in the early era of Soviet education, S.T. Schatzky, and Albert Pinkewitsch.