Jacob "Jack" Lew is the current Director of the US Office of Management and Budget and the Chief of Staff designate to President Barak Obama.

Lew (born August 29, 1955) grew up in New York City where he attended schooling through high school. He graduated magna cum laude from Harvard University in 1978 and received his J.D. from Georgetown University Law Center in 1983. Lew practiced law for a number of years after graduation and then re-entered into civil service in February 1993 when he was tasked as a Special Assistant to the President under President Bill Clinton. His primary responsibilities at the time included policy development and the drafting of the national service initiative (AmeriCorps) and health care reform legislation.

After leaving Clinton's White House for a number of years, Lew was nominated and confirmed as Clinton's Director of the Office of Management and Budget (OMB) in 1998. From 1998 to 2001, he led the Administration's budget team and served as a member of the National Security Council. During his tenure at OMB, the U.S. budget operated at a surplus for three consecutive years.

From 2001 to 2006, Lew was executive vice president and chief operating officer of New York University, where he was responsible for budget, finance, and operations. He was also a professor of public administration. From 2004 through 2008, Lew served on the Corporation for National and Community Service Board and chaired its Management, Administration, and Governance Committee. Lew was managing director and chief operating officer of Citi Alternative Investments (CAI) until January 2009. At CAI, he was responsible for operations, technology, finance, human resources, legal and regional coordination; chaired the CAI Operating Committee; and served as a member of the CAI Management Committee. Prior to joining CAI in January 2008, he was managing director and chief operating officer of Citi Global Wealth Management.

After President Obama entered the White House, Lew decided to return to government work in Washington. In January 2009, President Obama appointed Lew as Deputy Secretary of State for Management and Resources, where he would serve as Chief Operating Officer of the Department and as alter ego to Secretary Clinton. In November 2010, the Senate unanimously confirmed Lew for his new appointment from President Obama - Director of the Office of Management and Budget, following Peter Orszag's resignation.

On January 9, 2012, President Obama announced that Lew would replace Bill Daley as White House Chief of Staff. Lew is among at least nine Jews within the upper echelons of the Obama administration.

Lew is also observant of the Sabbath.