Jan Hammer
In 1968, during the dramatic events of the Warsaw Pact invasion of Czechoslovakia, the whole family moved to the United States. Jan Hammer Sr. received a one-year research fellowship in Washington, D.C., and Jan Hammer Jr. began to study at the Berklee College of Music in Boston. Their stay in the USA was entirely legal but the return to the Czechoslovakia brought them considerable problems. Jan Hammer Jr. remained in the United States, but his father's career in medicine was stopped. Andrea was not admitted to study at the Prague Conservatory. The one-year stay in a Western country was too suspicious for Czechoslovak communist regime.