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William Barrett had worked as an Associate at Shearman and Sterling from 1998 to 1999. William then became a Member/CEO of the full-service law firm Mandelbaum Barrett PC in 1999, where they also authored best-selling books related to dental deals and decision-making.

William Barrett's education history includes a Bachelor of Arts (B.A.) degree from Boston College and a Juris Doctor (J.D.) degree from the University of Virginia School of Law. No specific start or end years are provided for either educational experience.