sentences:  From 1967 to 1968, he set up the restoration workshop for the Musée Instrumental at the Paris Conservatoire.In the 1970s, he taught courses at Harvard and Boston University.At the time of the publication of his book, "Three Centuries of Harpsichord Making", in 1965, Ralph Kirkpatrick wrote that "he unquestionably knows more about the history and construction of harpsichords than anyone alive today".