From 1920 to 1921 he served as commissioner for the United States to the International Chamber of Commerce.
ATP International Series | International Monetary Fund | International Red Cross and Red Crescent Movement | ATP International Series Gold | International Space Station | Amnesty International | International Olympic Committee | BirdLife International | International Finance Corporation | International Organization for Standardization | International Telecommunication Union | International Criminal Court | One Day International | International Nonproprietary Name | International Labour Organization | Chamber of Deputies | International Civil Aviation Organization | International Boxing Federation | Toronto International Film Festival | International Atomic Energy Agency | International Maritime Organization | International Development Association | John F. Kennedy International Airport | Los Angeles International Airport | International Bank for Reconstruction and Development | International Court of Justice | chamber music | International Fund for Agricultural Development | Rotary International | Marriott International |
He chairs and is a panel member in a number of International Centre for Settlement of Investment Disputes (ICSID) and International Chamber of Commerce (ICC) cases.
Schwebel has been chairman or party-appointed arbitrator in International Chamber of Commerce (ICC), ICSID, AAA, Arbitration Institute of the Stockholm Chamber of Commerce (SCC), LCIA, Permanent Court of Arbitration (PCA), Japan Commercial Arbitration Association (CAA), and UNCITRAL ad hoc proceedings.
He later became the Publications Manager of the Singapore International Chamber of Commerce (SICC) before being crippled by Parkinson's disease.
He has served international and national organisations in various capacities, including as President of the Union Internationale des Avocats, Founder and Patron of the Anglo-Australasian Lawyers' Society, Chairman of the Chartered Institute of Arbitrators Australia, Member of the International Court of Arbitration of the International Chamber of Commerce, Member of the Council of the NSW Bar Association and Chairman of the NSW Council of Law Reporting.