Cohen became a vice-president of the International Association of Child and Adolescent Psychiatry and Allied Professions (IACAPAP) in 1986,[4] and was president from 1992–98,[5] where his work fostered "international collaborations in research and clinical care".[2] According to the Yale Bulletin, he was proud of his work in helping to promote child psychiatry in Gaza and in creating the Eastern Mediterranean Association of Child and Adolescent Psychiatry and Allied Professions (EMACAPAP), for which he served as chair of the international scientific committee.[2] He served as vice-president of the board of governors of Yale University Press,[2] was an analyst at the Western New England Institute of Psychoanalysis, and was a member of the Institute of Medicine of the National Academy of Sciences.[1] He held additional chair appointments with the Child Health and Development Institute, the International President of the Telefon Azzuro Foundation in Italy, and Schneider Children's Hospital of Israel.[2] He served on editorial boards in the United States as well as in France, Israel, and Great Britain.[2]