Coffin comes from a musical background: His father, Rev. William Sloane Coffin, studied to be a concert pianist with Nadia Boulanger in Paris, his grandfather was pianist Arthur Rubinstein, and his great-grandfather was Polish conductor Emil Mlynarski.
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Gruber received his B.A. degree in Medieval Studies from Princeton University where he studied with Joseph Strayer, William Chester Jordan, Robert Bergman, David Coffin, Robert Hollander and other distinguished scholars.