Robert David Sack (born October 4, 1939) is a senior United States circuit judge of the United States Court of Appeals for the Second Circuit.

Career output and lasting influence
Opinions attributed per year · peak 19/year
Later decisions citing those opinions, per year · peak 704/year
Second Circuit Court of Appeals · 1998–2009
Both charts share the same year axis. Opinion counts include only opinions in our corpus attributed to this judge so far — a year at zero can mean an attribution gap, not judicial silence. Influence typically outlasts the career: citations keep climbing after the last opinion.
- Gender
- Male
- Race
- White
Prior employment
- Private practice, New York City1964–1998
- impeachment inquiry, U.S. House of Representatives Committee on the JudiciaryAssociate special counsel and senior associate special counsel · 1974
Law clerk , Hon. Arthur Lane · 1963–1964
Appointments
1998–2009 · Appointed by William J. Clinton (Democratic)
Education
LL.B. · 1963- University of RochesterB.A. · 1960