Earlier in his career he has also held several posts in the public sector in Washington, D.C., including time as Assistant Secretary of the Treasury for Tax Policy.

He maintained that post through the early 1990s before becoming chief of staff for the 1994 Entitlement and Tax Reform Committee, which had considered raising the retirement age for Social Security recipients, increasing premiums for Medicare and restricting tax deductions for interest on home mortgages.

[29][30][31] Weinberger is also a member of the boards of directors for the National Bureau of Economic Research, Catalyst, American Council for Capital Formation, The Tax Council and The Bullis School; and the boards of trustees for Emory University and Case Western Reserve University.

[32][33] Weinberger co-chaired the Russia Foreign Investment Advisory Council[34] with Prime Minister Dmitry Medvedev.

[39] In June 2017, Weinberger and Lady Lynn Forester de Rothschild, announced that they were assembling CEOs from global companies, including Indra Nooyi, Paul Polman and Jamie Dimon, to work on a proof of concept to encourage and measure companies long-term value creation through human, physical, financial and intellectual capital deployment.

[40][41][42] Weinberger has spoken at the Milken Institute, World Economic Forum in Davos, Switzerland, and Aspen Ideas Festival.

[55] In September 2015, Weinberger delivered the Robert S. Hatfield Fellow in Economic Education lecture at Cornell University.

[57] His alma mater, Weatherhead School of Management at Case Western Reserve University honored Weinberger with the Braden Award in 2017.

[59] Weinberger has an honorary doctorate from the Kogod School of Business at American University in Washington DC .