From the 1950s until the end of her life Freud travelled regularly to the United States to lecture, teach and visit friends. During the 1970s she was concerned with the problems of emotionally deprived and socially disadvantaged children, and she studied deviations and delays in development. At Yale Law School, she taught seminars on crime and the family: this led to a transatlantic collaboration with Joseph Goldstein and Albert J. Solnit on children's needs and the law, published in three volumes as "Beyond the Best Interests of the Child" (1973), "Before the Best Interests of the Child" (1979), and "In the Best Interests of the Child" (1986).