Appointed earlier this year to head the markets group, the MIT economics Ph.D. and former forecaster manages the Fed's $2.1 trillion portfolio and gives advice to policymakers in
D.C. It's a high-profile gig: His predecessor, William Dudley, now heads the New York Fed.
Home front: When he relocated to Larchmont, N.Y., Sack immediately ruled out Tim Geithner's home, still for sale there.
NEXT: Aaron Patzer